# Functions

Functions return information from the database.

Functions return information from the database. This section describes functions that Vertica supports. Except for meta-functions, you can use a function anywhere an expression is allowed.

Meta-functions usually access the internal state of Vertica. They can be used in a top-level SELECT statement only, and the statement cannot contain other clauses such as FROM or WHERE. Meta-functions are labeled on their reference pages.

The Behavior Type section on each reference page categorizes the function's return behavior as one or more of the following:

**Immutable**(invariant): When run with a given set of arguments, immutable functions always produce the same result, regardless of environment or session settings such as locale.**Stable**: When run with a given set of arguments, stable functions produce the same result within a single query or scan operation. However, a stable function can produce different results when issued under different environments or at different times, such as change of locale and time zone—for example, SYSDATE.**Volatile**: Regardless of their arguments or environment, volatile functions can return a different result with each invocation—for example, UUID_GENERATE.

## List of all functions

The following list contains all Vertica SQL functions.

Jump to letter: A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

### A

- ABS
- Returns the absolute value of the argument. [Mathematical functions]
- ACOS
- Returns a DOUBLE PRECISION value representing the trigonometric inverse cosine of the argument. [Mathematical functions]
- ACOSH
- Returns a DOUBLE PRECISION value that represents the inverse (arc) hyperbolic cosine of the function argument. [Mathematical functions]
- ACTIVE_SCHEDULER_NODE
- Returns the active scheduler node. [Stored procedure functions]
- ADD_MONTHS
- Adds the specified number of months to a date and returns the sum as a DATE. [Date/time functions]
- ADVANCE_EPOCH
- Manually closes the current epoch and begins a new epoch. [Epoch functions]
- AGE_IN_MONTHS
- Returns the difference in months between two dates, expressed as an integer. [Date/time functions]
- AGE_IN_YEARS
- Returns the difference in years between two dates, expressed as an integer. [Date/time functions]
- ALTER_LOCATION_LABEL
- Adds a label to a storage location, or changes or removes an existing label. [Storage functions]
- ALTER_LOCATION_SIZE
- Resizes on one node, all nodes in a subcluster, or all nodes in the database. [Eon Mode functions]
- ALTER_LOCATION_USE
- Alters the type of data that a storage location holds. [Storage functions]
- ANALYZE_CONSTRAINTS
- Analyzes and reports on constraint violations within the specified scope. [Table functions]
- ANALYZE_CORRELATIONS
- This function is deprecated and will be removed in a future release. [Table functions]
- ANALYZE_EXTERNAL_ROW_COUNT
- Calculates the exact number of rows in an external table. [Statistics management functions]
- ANALYZE_STATISTICS
- Collects and aggregates data samples and storage information from all nodes that store projections associated with the specified table. [Statistics management functions]
- ANALYZE_STATISTICS_PARTITION
- Collects and aggregates data samples and storage information for a range of partitions in the specified table. [Statistics management functions]
- ANALYZE_WORKLOAD
- Runs Workload Analyzer, a utility that analyzes system information held in system tables. [Workload management functions]
- APPLY_AVG
- Returns the average of all elements in a with numeric values. [Collection functions]
- APPLY_BISECTING_KMEANS
- Applies a trained bisecting k-means model to an input relation, and assigns each new data point to the closest matching cluster in the trained model. [Transformation functions]
- APPLY_COUNT (ARRAY_COUNT)
- Returns the total number of non-null elements in a. [Collection functions]
- APPLY_COUNT_ELEMENTS (ARRAY_LENGTH)
- Returns the total number of elements in a , including NULLs. [Collection functions]
- APPLY_IFOREST
- Applies an isolation forest (iForest) model to an input relation. [Transformation functions]
- APPLY_INVERSE_PCA
- Inverts the APPLY_PCA-generated transform back to the original coordinate system. [Transformation functions]
- APPLY_INVERSE_SVD
- Transforms the data back to the original domain. [Transformation functions]
- APPLY_KMEANS
- Assigns each row of an input relation to a cluster center from an existing k-means model. [Transformation functions]
- APPLY_KPROTOTYPES
- Assigns each row of an input relation to a cluster center from an existing k-prototypes model. [Transformation functions]
- APPLY_MAX
- Returns the largest non-null element in a. [Collection functions]
- APPLY_MIN
- Returns the smallest non-null element in a. [Collection functions]
- APPLY_NORMALIZE
- A UDTF function that applies the normalization parameters saved in a model to a set of specified input columns. [Transformation functions]
- APPLY_ONE_HOT_ENCODER
- A user-defined transform function (UDTF) that loads the one hot encoder model and writes out a table that contains the encoded columns. [Transformation functions]
- APPLY_PCA
- Transforms the data using a PCA model. [Transformation functions]
- APPLY_SUM
- Computes the sum of all elements in a of numeric values (INTEGER, FLOAT, NUMERIC, or INTERVAL). [Collection functions]
- APPLY_SVD
- Transforms the data using an SVD model. [Transformation functions]
- APPROXIMATE_COUNT_DISTINCT
- Returns the number of distinct non-NULL values in a data set. [Aggregate functions]
- APPROXIMATE_COUNT_DISTINCT_OF_SYNOPSIS
- Calculates the number of distinct non-NULL values from the synopsis objects created by APPROXIMATE_COUNT_DISTINCT_SYNOPSIS. [Aggregate functions]
- APPROXIMATE_COUNT_DISTINCT_SYNOPSIS
- Summarizes the information of distinct non-NULL values and materializes the result set in a VARBINARY or LONG VARBINARY synopsis object. [Aggregate functions]
- APPROXIMATE_COUNT_DISTINCT_SYNOPSIS_MERGE
- Aggregates multiple synopses into one new synopsis. [Aggregate functions]
- APPROXIMATE_MEDIAN [aggregate]
- Computes the approximate median of an expression over a group of rows. [Aggregate functions]
- APPROXIMATE_PERCENTILE [aggregate]
- Computes the approximate percentile of an expression over a group of rows. [Aggregate functions]
- APPROXIMATE_QUANTILES
- Computes an array of weighted, approximate percentiles of a column within some user-specified error. [Aggregate functions]
- ARGMAX [analytic]
- This function is patterned after the mathematical function argmax(f(x)), which returns the value of x that maximizes f(x). [Analytic functions]
- ARGMAX_AGG
- Takes two arguments target and arg, where both are columns or column expressions in the queried dataset. [Aggregate functions]
- ARGMIN [analytic]
- This function is patterned after the mathematical function argmin(f(x)), which returns the value of x that minimizes f(x). [Analytic functions]
- ARGMIN_AGG
- Takes two arguments target and arg, where both are columns or column expressions in the queried dataset. [Aggregate functions]
- ARIMA
- Creates and trains an autoregressive integrated moving average (ARIMA) model from a time series with consistent timesteps. [Machine learning algorithms]
- ARRAY_CAT
- Concatenates two arrays of the same element type and dimensionality. [Collection functions]
- ARRAY_CONTAINS
- Returns true if the specified element is found in the array and false if not. [Collection functions]
- ARRAY_DIMS
- Returns the dimensionality of the input array. [Collection functions]
- ARRAY_FIND
- Returns the ordinal position of a specified element in an array, or -1 if not found. [Collection functions]
- ASCII
- Converts the first character of a VARCHAR datatype to an INTEGER. [String functions]
- ASIN
- Returns a DOUBLE PRECISION value representing the trigonometric inverse sine of the argument. [Mathematical functions]
- ASINH
- Returns a DOUBLE PRECISION value that represents the inverse (arc) hyperbolic sine of the function argument. [Mathematical functions]
- ATAN
- Returns a DOUBLE PRECISION value representing the trigonometric inverse tangent of the argument. [Mathematical functions]
- ATAN2
- Returns a DOUBLE PRECISION value representing the trigonometric inverse tangent of the arithmetic dividend of the arguments. [Mathematical functions]
- ATANH
- Returns a DOUBLE PRECISION value that represents the inverse hyperbolic tangent of the function argument. [Mathematical functions]
- AUDIT
- Returns the raw data size (in bytes) of a database, schema, or table as it is counted in an audit of the database size. [License functions]
- AUDIT_FLEX
- Returns the estimated ROS size of __raw__ columns, equivalent to the export size of the flex data in the audited objects. [License functions]
- AUDIT_LICENSE_SIZE
- Triggers an immediate audit of the database size to determine if it is in compliance with the raw data storage allowance included in your Vertica licenses. [License functions]
- AUDIT_LICENSE_TERM
- Triggers an immediate audit to determine if the Vertica license has expired. [License functions]
- AUTOREGRESSOR
- Creates an autoregressive (AR) model from a stationary time series with consistent timesteps that can then be used for prediction via PREDICT_AR. [Machine learning algorithms]
- AVG [aggregate]
- Computes the average (arithmetic mean) of an expression over a group of rows. [Aggregate functions]
- AVG [analytic]
- Computes an average of an expression in a group within a. [Analytic functions]
- AZURE_TOKEN_CACHE_CLEAR
- Clears the cached access token for Azure. [Cloud functions]

### B

- BACKGROUND_DEPOT_WARMING
- Vertica version 10.0.0 removes support for foreground depot warming. [Eon Mode functions]
- BALANCE
- Returns a view with an equal distribution of the input data based on the response_column. [Data preparation]
- BISECTING_KMEANS
- Executes the bisecting k-means algorithm on an input relation. [Machine learning algorithms]
- BIT_AND
- Takes the bitwise AND of all non-null input values. [Aggregate functions]
- BIT_LENGTH
- Returns the length of the string expression in bits (bytes * 8) as an INTEGER. [String functions]
- BIT_OR
- Takes the bitwise OR of all non-null input values. [Aggregate functions]
- BIT_XOR
- Takes the bitwise XOR of all non-null input values. [Aggregate functions]
- BITCOUNT
- Returns the number of one-bits (sometimes referred to as set-bits) in the given VARBINARY value. [String functions]
- BITSTRING_TO_BINARY
- Translates the given VARCHAR bitstring representation into a VARBINARY value. [String functions]
- BOOL_AND [aggregate]
- Processes Boolean values and returns a Boolean value result. [Aggregate functions]
- BOOL_AND [analytic]
- Returns the Boolean value of an expression within a. [Analytic functions]
- BOOL_OR [aggregate]
- Processes Boolean values and returns a Boolean value result. [Aggregate functions]
- BOOL_OR [analytic]
- Returns the Boolean value of an expression within a. [Analytic functions]
- BOOL_XOR [aggregate]
- Processes Boolean values and returns a Boolean value result. [Aggregate functions]
- BOOL_XOR [analytic]
- Returns the Boolean value of an expression within a. [Analytic functions]
- BTRIM
- Removes the longest string consisting only of specified characters from the start and end of a string. [String functions]
- BUILD_FLEXTABLE_VIEW
- Creates, or re-creates, a view for a default or user-defined keys table, ignoring any empty keys. [Flex data functions]

### C

- CALENDAR_HIERARCHY_DAY
- Specifies to group DATE partition keys into a hierarchy of years, months, and days. [Partition functions]
- CANCEL_DEPOT_WARMING
- Cancels depot warming on a node. [Eon Mode functions]
- CANCEL_DRAIN_SUBCLUSTER
- Cancels the draining of a subcluster or subclusters. [Eon Mode functions]
- CANCEL_REBALANCE_CLUSTER
- Stops any rebalance task that is currently in progress or is waiting to execute. [Cluster functions]
- CANCEL_REFRESH
- Cancels refresh-related internal operations initiated by START_REFRESH and REFRESH. [Session functions]
- CBRT
- Returns the cube root of the argument. [Mathematical functions]
- CEILING
- Rounds up the returned value up to the next whole number. [Mathematical functions]
- CHANGE_CURRENT_STATEMENT_RUNTIME_PRIORITY
- Changes the run-time priority of an active query. [Workload management functions]
- CHANGE_MODEL_STATUS
- Changes the status of a registered model. [Model management]
- CHANGE_RUNTIME_PRIORITY
- Changes the run-time priority of a query that is actively running. [Workload management functions]
- CHARACTER_LENGTH
- The CHARACTER_LENGTH() function:. [String functions]
- CHR
- Converts the first character of an INTEGER datatype to a VARCHAR. [String functions]
- CLEAN_COMMUNAL_STORAGE
- Marks for deletion invalid data in communal storage, often data that leaked due to an event where Vertica cleanup mechanisms failed. [Eon Mode functions]
- CLEAR_CACHES
- Clears the Vertica internal cache files. [Storage functions]
- CLEAR_DATA_COLLECTOR
- Clears all memory and disk records from Data Collector tables and logs, and resets collection statistics in system table DATA_COLLECTOR. [Data collector functions]
- CLEAR_DATA_DEPOT
- Deletes the specified depot data. [Eon Mode functions]
- CLEAR_DEPOT_PIN_POLICY_PARTITION
- Clears a depot pinning policy from the specified table or projection partitions. [Eon Mode functions]
- CLEAR_DEPOT_PIN_POLICY_PROJECTION
- Clears a depot pinning policy from the specified projection. [Eon Mode functions]
- CLEAR_DEPOT_PIN_POLICY_TABLE
- Clears a depot pinning policy from the specified table. [Eon Mode functions]
- CLEAR_FETCH_QUEUE
- Removes all entries or entries for a specific transaction from the queue of fetch requests of data from the communal storage. [Eon Mode functions]
- CLEAR_HDFS_CACHES
- Clears the configuration information copied from HDFS and any cached connections. [Hadoop functions]
- CLEAR_OBJECT_STORAGE_POLICY
- Removes a user-defined storage policy from the specified database, schema or table. [Storage functions]
- CLEAR_PROFILING
- Clears from memory data for the specified profiling type. [Profiling functions]
- CLEAR_PROJECTION_REFRESHES
- Clears information projection refresh history from system table PROJECTION_REFRESHES. [Projection functions]
- CLEAR_RESOURCE_REJECTIONS
- Clears the content of the RESOURCE_REJECTIONS and DISK_RESOURCE_REJECTIONS system tables. [Database functions]
- CLOCK_TIMESTAMP
- Returns a value of type TIMESTAMP WITH TIMEZONE that represents the current system-clock time. [Date/time functions]
- CLOSE_ALL_RESULTSETS
- Closes all result set sessions within Multiple Active Result Sets (MARS) and frees the MARS storage for other result sets. [Client connection functions]
- CLOSE_ALL_SESSIONS
- Closes all external sessions except the one that issues this function. [Session functions]
- CLOSE_RESULTSET
- Closes a specific result set within Multiple Active Result Sets (MARS) and frees the MARS storage for other result sets. [Client connection functions]
- CLOSE_SESSION
- Interrupts the specified external session, rolls back the current transaction if any, and closes the socket. [Session functions]
- CLOSE_USER_SESSIONS
- Stops the session for a user, rolls back any transaction currently running, and closes the connection. [Session functions]
- COALESCE
- Returns the value of the first non-null expression in the list. [NULL-handling functions]
- COLLATION
- Applies a collation to two or more strings. [String functions]
- COMPACT_STORAGE
- Bundles existing data (.fdb) and index (.pidx) files into the .gt file format. [Database functions]
- COMPUTE_FLEXTABLE_KEYS
- Computes the virtual columns (keys and values) from flex table VMap data. [Flex data functions]
- COMPUTE_FLEXTABLE_KEYS_AND_BUILD_VIEW
- Combines the functionality of BUILD_FLEXTABLE_VIEW and COMPUTE_FLEXTABLE_KEYS to compute virtual columns (keys) from the VMap data of a flex table and construct a view. [Flex data functions]
- CONCAT
- Concatenates two strings and returns a varchar data type. [String functions]
- CONDITIONAL_CHANGE_EVENT [analytic]
- Assigns an event window number to each row, starting from 0, and increments by 1 when the result of evaluating the argument expression on the current row differs from that on the previous row. [Analytic functions]
- CONDITIONAL_TRUE_EVENT [analytic]
- Assigns an event window number to each row, starting from 0, and increments the number by 1 when the result of the boolean argument expression evaluates true. [Analytic functions]
- CONFUSION_MATRIX
- Computes the confusion matrix of a table with observed and predicted values of a response variable. [Model evaluation]
- CONTAINS
- Returns true if the specified element is found in the collection and false if not. [Collection functions]
- COPY_PARTITIONS_TO_TABLE
- Copies partitions from one table to another. [Partition functions]
- COPY_TABLE
- Copies one table to another. [Table functions]
- CORR
- Returns the DOUBLE PRECISION coefficient of correlation of a set of expression pairs, as per the Pearson correlation coefficient. [Aggregate functions]
- CORR_MATRIX
- Takes an input relation with numeric columns, and calculates the Pearson Correlation Coefficient between each pair of its input columns. [Data preparation]
- COS
- Returns a DOUBLE PRECISION value tat represents the trigonometric cosine of the passed parameter. [Mathematical functions]
- COSH
- Returns a DOUBLE PRECISION value that represents the hyperbolic cosine of the passed parameter. [Mathematical functions]
- COT
- Returns a DOUBLE PRECISION value representing the trigonometric cotangent of the argument. [Mathematical functions]
- COUNT [aggregate]
- Returns as a BIGINT the number of rows in each group where the expression is not NULL. [Aggregate functions]
- COUNT [analytic]
- Counts occurrences within a group within a. [Analytic functions]
- COVAR_POP
- Returns the population covariance for a set of expression pairs. [Aggregate functions]
- COVAR_SAMP
- Returns the sample covariance for a set of expression pairs. [Aggregate functions]
- CROSS_VALIDATE
- Performs k-fold cross validation on a learning algorithm using an input relation, and grid search for hyper parameters. [Model evaluation]
- CUME_DIST [analytic]
- Calculates the cumulative distribution, or relative rank, of the current row with regard to other rows in the same partition within a . [Analytic functions]
- CURRENT_DATABASE
- Returns the name of the current database, equivalent to DBNAME. [System information functions]
- CURRENT_DATE
- Returns the date (date-type value) on which the current transaction started. [Date/time functions]
- CURRENT_LOAD_SOURCE
- When called within the scope of a COPY statement, returns the file name used for the load. [System information functions]
- CURRENT_SCHEMA
- Returns the name of the current schema. [System information functions]
- CURRENT_SESSION
- Returns the ID of the current client session. [System information functions]
- CURRENT_TIME
- Returns a value of type TIME WITH TIMEZONE that represents the start of the current transaction. [Date/time functions]
- CURRENT_TIMESTAMP
- Returns a value of type TIME WITH TIMEZONE that represents the start of the current transaction. [Date/time functions]
- CURRENT_TRANS_ID
- Returns the ID of the transaction currently in progress. [System information functions]
- CURRENT_USER
- Returns a VARCHAR containing the name of the user who initiated the current database connection. [System information functions]
- CURRVAL
- Returns the last value across all nodes that was set by NEXTVAL on this sequence in the current session. [Sequence functions]

### D

- DATA_COLLECTOR_HELP
- Returns online usage instructions about the Data Collector, the V_MONITOR.DATA_COLLECTOR system table, and the Data Collector control functions. [Data collector functions]
- DATE
- Converts the input value to a DATE data type. [Date/time functions]
- DATE_PART
- Extracts a sub-field such as year or hour from a date/time expression, equivalent to the the SQL-standard function EXTRACT. [Date/time functions]
- DATE_TRUNC
- Truncates date and time values to the specified precision. [Date/time functions]
- DATEDIFF
- Returns the time span between two dates, in the intervals specified. [Date/time functions]
- DAY
- Returns as an integer the day of the month from the input value. [Date/time functions]
- DAYOFMONTH
- Returns the day of the month as an integer. [Date/time functions]
- DAYOFWEEK
- Returns the day of the week as an integer, where Sunday is day 1. [Date/time functions]
- DAYOFWEEK_ISO
- Returns the ISO 8061 day of the week as an integer, where Monday is day 1. [Date/time functions]
- DAYOFYEAR
- Returns the day of the year as an integer, where January 1 is day 1. [Date/time functions]
- DAYS
- Returns the integer value of the specified date, where 1 AD is 1. [Date/time functions]
- DBNAME (function)
- Returns the name of the current database, equivalent to CURRENT_DATABASE. [System information functions]
- DECODE
- Compares expression to each search value one by one. [String functions]
- DEGREES
- Converts an expression from radians to fractional degrees, or from degrees, minutes, and seconds to fractional degrees. [Mathematical functions]
- DELETE_TOKENIZER_CONFIG_FILE
- Deletes a tokenizer configuration file. [Text search functions]
- DEMOTE_SUBCLUSTER_TO_SECONDARY
- Converts a to a . [Eon Mode functions]
- DENSE_RANK [analytic]
- Within each window partition, ranks all rows in the query results set according to the order specified by the window's ORDER BY clause. [Analytic functions]
- DESCRIBE_LOAD_BALANCE_DECISION
- Evaluates if any load balancing routing rules apply to a given IP address and This function is useful when you are evaluating connection load balancing policies you have created, to ensure they work the way you expect them to. [Client connection functions]
- DESIGNER_ADD_DESIGN_QUERIES
- Reads and evaluates queries from an input file, and adds the queries that it accepts to the specified design. [Database Designer functions]
- DESIGNER_ADD_DESIGN_QUERIES_FROM_RESULTS
- Executes the specified query and evaluates results in the following columns:. [Database Designer functions]
- DESIGNER_ADD_DESIGN_QUERY
- Reads and parses the specified query, and if accepted, adds it to the design. [Database Designer functions]
- DESIGNER_ADD_DESIGN_TABLES
- Adds the specified tables to a design. [Database Designer functions]
- DESIGNER_CANCEL_POPULATE_DESIGN
- Cancels population or deployment operation for the specified design if it is currently running. [Database Designer functions]
- DESIGNER_CREATE_DESIGN
- Creates a design with the specified name. [Database Designer functions]
- DESIGNER_DESIGN_PROJECTION_ENCODINGS
- Analyzes encoding in the specified projections, creates a script to implement encoding recommendations, and optionally deploys the recommendations. [Database Designer functions]
- DESIGNER_DROP_ALL_DESIGNS
- Removes all Database Designer-related schemas associated with the current user. [Database Designer functions]
- DESIGNER_DROP_DESIGN
- Removes the schema associated with the specified design and all its contents. [Database Designer functions]
- DESIGNER_OUTPUT_ALL_DESIGN_PROJECTIONS
- Displays the DDL statements that define the design projections to standard output. [Database Designer functions]
- DESIGNER_OUTPUT_DEPLOYMENT_SCRIPT
- Displays the deployment script for the specified design to standard output. [Database Designer functions]
- DESIGNER_RESET_DESIGN
- Discards all run-specific information of the previous Database Designer build or deployment of the specified design but keeps its configuration. [Database Designer functions]
- DESIGNER_RUN_POPULATE_DESIGN_AND_DEPLOY
- Populates the design and creates the design and deployment scripts. [Database Designer functions]
- DESIGNER_SET_DESIGN_KSAFETY
- Sets K-safety for a comprehensive design and stores the K-safety value in the DESIGNS table. [Database Designer functions]
- DESIGNER_SET_DESIGN_TYPE
- Specifies whether Database Designer creates a comprehensive or incremental design. [Database Designer functions]
- DESIGNER_SET_OPTIMIZATION_OBJECTIVE
- Valid only for comprehensive database designs, specifies the optimization objective Database Designer uses. [Database Designer functions]
- DESIGNER_SET_PROPOSE_UNSEGMENTED_PROJECTIONS
- Specifies whether a design can include unsegmented projections. [Database Designer functions]
- DESIGNER_SINGLE_RUN
- Evaluates all queries that completed execution within the specified timespan, and returns with a design that is ready for deployment. [Database Designer functions]
- DESIGNER_WAIT_FOR_DESIGN
- Waits for completion of operations that are populating and deploying the design. [Database Designer functions]
- DETECT_OUTLIERS
- Returns the outliers in a data set based on the outlier threshold. [Data preparation]
- DISABLE_DUPLICATE_KEY_ERROR
- Disables error messaging when Vertica finds duplicate primary or unique key values at run time (for use with key constraints that are not automatically enabled). [Table functions]
- DISABLE_LOCAL_SEGMENTS
- Disables local data segmentation, which breaks projections segments on nodes into containers that can be easily moved to other nodes. [Cluster functions]
- DISABLE_PROFILING
- Disables for the current session collection of profiling data of the specified type. [Profiling functions]
- DISPLAY_LICENSE
- Returns the terms of your Vertica license. [License functions]
- DISTANCE
- Returns the distance (in kilometers) between two points. [Mathematical functions]
- DISTANCEV
- Returns the distance (in kilometers) between two points using the Vincenty formula. [Mathematical functions]
- DO_TM_TASK
- Runs a (TM) operation and commits current transactions. [Storage functions]
- DROP_EXTERNAL_ROW_COUNT
- Removes external table row count statistics compiled by ANALYZE_EXTERNAL_ROW_COUNT. [Statistics management functions]
- DROP_LICENSE
- Drops a license key from the global catalog. [Catalog functions]
- DROP_LOCATION
- Permanently removes a retired storage location. [Storage functions]
- DROP_PARTITIONS
- Drops the specified table partition keys. [Partition functions]
- DROP_STATISTICS
- Removes statistical data on database projections previously generated by ANALYZE_STATISTICS. [Statistics management functions]
- DROP_STATISTICS_PARTITION
- Removes statistical data on database projections previously generated by ANALYZE_STATISTICS_PARTITION. [Statistics management functions]
- DUMP_CATALOG
- Returns an internal representation of the Vertica catalog. [Catalog functions]
- DUMP_LOCKTABLE
- Returns information about deadlocked clients and the resources they are waiting for. [Database functions]
- DUMP_PARTITION_KEYS
- Dumps the partition keys of all projections in the system. [Database functions]
- DUMP_PROJECTION_PARTITION_KEYS
- Dumps the partition keys of the specified projection. [Partition functions]
- DUMP_TABLE_PARTITION_KEYS
- Dumps the partition keys of all projections for the specified table. [Partition functions]

### E

- EDIT_DISTANCE
- Calculates and returns the Levenshtein distance between two strings. [String functions]
- EMPTYMAP
- Constructs a new VMap with one row but without keys or data. [Flex map functions]
- ENABLE_ELASTIC_CLUSTER
- Enables elastic cluster scaling, which makes enlarging or reducing the size of your database cluster more efficient by segmenting a node's data into chunks that can be easily moved to other hosts. [Cluster functions]
- ENABLE_LOCAL_SEGMENTS
- Enables local storage segmentation, which breaks projections segments on nodes into containers that can be easily moved to other nodes. [Cluster functions]
- ENABLE_PROFILING
- Enables collection of profiling data of the specified type for the current session. [Profiling functions]
- ENABLE_SCHEDULE
- Enables or disables a schedule. [Stored procedure functions]
- ENABLE_TRIGGER
- Enables or disables a trigger. [Stored procedure functions]
- ENABLED_ROLE
- Checks whether a Vertica user role is enabled, and returns true or false. [Privileges and access functions]
- ENFORCE_OBJECT_STORAGE_POLICY
- Applies storage policies of the specified object immediately. [Storage functions]
- ERROR_RATE
- Using an input table, returns a table that calculates the rate of incorrect classifications and displays them as FLOAT values. [Model evaluation]
- EVALUATE_DELETE_PERFORMANCE
- Evaluates projections for potential DELETE and UPDATE performance issues. [Projection functions]
- EVENT_NAME
- Returns a VARCHAR value representing the name of the event that matched the row. [MATCH clause functions]
- EXECUTE_TRIGGER
- Manually executes the stored procedure attached to a trigger. [Stored procedure functions]
- EXP
- Returns the exponential function, e to the power of a number. [Mathematical functions]
- EXPLODE
- Expands the elements of one or more collection columns (ARRAY or SET) into individual table rows, one row per element. [Collection functions]
- EXPONENTIAL_MOVING_AVERAGE [analytic]
- Calculates the exponential moving average (EMA) of expression E with smoothing factor X. [Analytic functions]
- EXPORT_CATALOG
- This function and EXPORT_OBJECTS return equivalent output. [Catalog functions]
- EXPORT_DIRECTED_QUERIES
- Generates SQL for creating directed queries from a set of input queries. [Directed queries functions]
- EXPORT_MODELS
- Exports machine learning models. [Model management]
- EXPORT_OBJECTS
- This function and EXPORT_CATALOG return equivalent output. [Catalog functions]
- EXPORT_STATISTICS
- Generates statistics in XML format from data previously collected by ANALYZE_STATISTICS. [Statistics management functions]
- EXPORT_STATISTICS_PARTITION
- Generates partition-level statistics in XML format from data previously collected by ANALYZE_STATISTICS_PARTITION. [Statistics management functions]
- EXPORT_TABLES
- Generates a SQL script that can be used to recreate a logical schema—schemas, tables, constraints, and views—on another cluster. [Catalog functions]
- EXTERNAL_CONFIG_CHECK
- Tests the Hadoop configuration of a Vertica cluster. [Hadoop functions]
- EXTRACT
- Retrieves sub-fields such as year or hour from date/time values and returns values of type NUMERIC. [Date/time functions]

### F

- FILTER
- Takes an input array and returns an array containing only elements that meet a specified condition. [Collection functions]
- FINISH_FETCHING_FILES
- Fetches to the depot all files that are queued for download from communal storage. [Eon Mode functions]
- FIRST_VALUE [analytic]
- Lets you select the first value of a table or partition (determined by the window-order-clause) without having to use a self join. [Analytic functions]
- FLOOR
- Rounds down the returned value to the previous whole number. [Mathematical functions]
- FLUSH_DATA_COLLECTOR
- Waits until memory logs are moved to disk and then flushes the Data Collector, synchronizing the log with disk storage. [Data collector functions]
- FLUSH_REAPER_QUEUE
- Deletes all data marked for deletion in the database. [Eon Mode functions]

### G

- GET_AHM_EPOCH
- Returns the number of the in which the is located. [Epoch functions]
- GET_AHM_TIME
- Returns a TIMESTAMP value representing the. [Epoch functions]
- GET_AUDIT_TIME
- Reports the time when the automatic audit of database size occurs. [License functions]
- GET_CLIENT_LABEL
- Returns the client connection label for the current session. [Client connection functions]
- GET_COMPLIANCE_STATUS
- Displays whether your database is in compliance with your Vertica license agreement. [License functions]
- GET_CONFIG_PARAMETER
- Gets the value of a configuration parameter at the specified level. [Database functions]
- GET_CURRENT_EPOCH
- Returns the number of the current epoch. [Epoch functions]
- GET_DATA_COLLECTOR_NOTIFY_POLICY
- Lists any notification policies set on a component. [Notifier functions]
- GET_DATA_COLLECTOR_POLICY
- Retrieves a brief statement about the retention policy for the specified component. [Data collector functions]
- GET_LAST_GOOD_EPOCH
- Returns the number. [Epoch functions]
- GET_METADATA
- Returns the metadata of a Parquet file. [Hadoop functions]
- GET_MODEL_ATTRIBUTE
- Extracts either a specific attribute from a model or all attributes from a model. [Model management]
- GET_MODEL_SUMMARY
- Returns summary information of a model. [Model management]
- GET_NUM_ACCEPTED_ROWS
- Returns the number of rows loaded into the database for the last completed load for the current session. [Session functions]
- GET_NUM_REJECTED_ROWS
- Returns the number of rows that were rejected during the last completed load for the current session. [Session functions]
- GET_PRIVILEGES_DESCRIPTION
- Returns the effective privileges the current user has on an object, including explicit, implicit, inherited, and role-based privileges. [Privileges and access functions]
- GET_PROJECTION_SORT_ORDER
- Returns the order of columns in a projection's ORDER BY clause. [Projection functions]
- GET_PROJECTION_STATUS
- Returns information relevant to the status of a :. [Projection functions]
- GET_PROJECTIONS
- Returns contextual and projection information about projections of the specified anchor table. [Projection functions]
- GET_TOKENIZER_PARAMETER
- Returns the configuration parameter for a given tokenizer. [Text search functions]
- GETDATE
- Returns the current statement's start date and time as a TIMESTAMP value. [Date/time functions]
- GETUTCDATE
- Returns the current statement's start date and time as a TIMESTAMP value. [Date/time functions]
- GREATEST
- Returns the largest value in a list of expressions of any data type. [String functions]
- GREATESTB
- Returns the largest value in a list of expressions of any data type, using binary ordering. [String functions]
- GROUP_ID
- Uniquely identifies duplicate sets for GROUP BY queries that return duplicate grouping sets. [Aggregate functions]
- GROUPING
- Disambiguates the use of NULL values when GROUP BY queries with multilevel aggregates generate NULL values to identify subtotals in grouping columns. [Aggregate functions]
- GROUPING_ID
- Concatenates the set of Boolean values generated by the GROUPING function into a bit vector. [Aggregate functions]

### H

- HADOOP_IMPERSONATION_CONFIG_CHECK
- Reports the delegation tokens Vertica will use when accessing Kerberized data in HDFS. [Hadoop functions]
- HAS_ROLE
- Checks whether a Vertica user role is granted to the specified user or role, and returns true or false. [Privileges and access functions]
- HAS_TABLE_PRIVILEGE
- Returns true or false to verify whether a user has the specified privilege on a table. [System information functions]
- HASH
- Calculates a hash value over the function arguments, producing a value in the range 0 <= x < 263. [Mathematical functions]
- HASH_EXTERNAL_TOKEN
- Returns a hash of a string token, for use with HADOOP_IMPERSONATION_CONFIG_CHECK. [Hadoop functions]
- HCATALOGCONNECTOR_CONFIG_CHECK
- Tests the configuration of a Vertica cluster that uses the HCatalog Connector to access Hive data. [Hadoop functions]
- HDFS_CLUSTER_CONFIG_CHECK
- Tests the configuration of a Vertica cluster that uses HDFS. [Hadoop functions]
- HEX_TO_BINARY
- Translates the given VARCHAR hexadecimal representation into a VARBINARY value. [String functions]
- HEX_TO_INTEGER
- Translates the given VARCHAR hexadecimal representation into an INTEGER value. [String functions]
- HOUR
- Returns the hour portion of the specified date as an integer, where 0 is 00:00 to 00:59. [Date/time functions]

### I

- IFNULL
- Returns the value of the first non-null expression in the list. [NULL-handling functions]
- IFOREST
- Trains and returns an isolation forest (iForest) model. [Data preparation]
- IMPLODE
- Takes a column of any scalar type and returns an unbounded array. [Collection functions]
- IMPORT_DIRECTED_QUERIES
- Imports to the database catalog directed queries from a SQL file that was generated by EXPORT_DIRECTED_QUERIES. [Directed queries functions]
- IMPORT_MODELS
- Imports models into Vertica, either Vertica models that were exported with EXPORT_MODELS, or models in Predictive Model Markup Language (PMML) or TensorFlow format. [Model management]
- IMPORT_STATISTICS
- Imports statistics from the XML file that was generated by EXPORT_STATISTICS. [Statistics management functions]
- IMPUTE
- Imputes missing values in a data set with either the mean or the mode, based on observed values for a variable in each column. [Data preparation]
- INET_ATON
- Converts a string that contains a dotted-quad representation of an IPv4 network address to an INTEGER. [IP address functions]
- INET_NTOA
- Converts an INTEGER value into a VARCHAR dotted-quad representation of an IPv4 network address. [IP address functions]
- INFER_EXTERNAL_TABLE_DDL
- This function is deprecated and will be removed in a future release. [Table functions]
- INFER_TABLE_DDL
- Inspects a file in Parquet, ORC, JSON, or Avro format and returns a CREATE TABLE or CREATE EXTERNAL TABLE statement based on its contents. [Table functions]
- INITCAP
- Capitalizes first letter of each alphanumeric word and puts the rest in lowercase. [String functions]
- INITCAPB
- Capitalizes first letter of each alphanumeric word and puts the rest in lowercase. [String functions]
- INSERT
- Inserts a character string into a specified location in another character string. [String functions]
- INSTALL_LICENSE
- Installs the license key in the global catalog. [Catalog functions]
- INSTR
- Searches string for substring and returns an integer indicating the position of the character in string that is the first character of this occurrence. [String functions]
- INSTRB
- Searches string for substring and returns an integer indicating the octet position within string that is the first occurrence. [String functions]
- INTERRUPT_STATEMENT
- Interrupts the specified statement in a user session, rolls back the current transaction, and writes a success or failure message to the log file. [Session functions]
- ISFINITE
- Tests for the special TIMESTAMP constant INFINITY and returns a value of type BOOLEAN. [Date/time functions]
- ISNULL
- Returns the value of the first non-null expression in the list. [NULL-handling functions]
- ISUTF8
- Tests whether a string is a valid UTF-8 string. [String functions]

### J

- JARO_DISTANCE
- Calculates and returns the Jaro similarity, an edit distance between two sequences. [String functions]
- JARO_WINKLER_DISTANCE
- Calculates and returns the Jaro-Winkler similarity, an edit distance between two sequences. [String functions]
- JULIAN_DAY
- Returns the integer value of the specified day according to the Julian calendar, where day 1 is the first day of the Julian period, January 1, 4713 BC (on the Gregorian calendar, November 24, 4714 BC). [Date/time functions]

### K

- KERBEROS_CONFIG_CHECK
- Tests the Kerberos configuration of a Vertica cluster. [Database functions]
- KERBEROS_HDFS_CONFIG_CHECK
- This function is deprecated and will be removed in a future release. [Hadoop functions]
- KMEANS
- Executes the k-means algorithm on an input relation. [Machine learning algorithms]
- KPROTOTYPES
- Executes the k-prototypes algorithm on an input relation. [Machine learning algorithms]

### L

- LAG [analytic]
- Returns the value of the input expression at the given offset before the current row within a. [Analytic functions]
- LAST_DAY
- Returns the last day of the month in the specified date. [Date/time functions]
- LAST_INSERT_ID
- Returns the last value of an IDENTITY column. [Table functions]
- LAST_VALUE [analytic]
- Lets you select the last value of a table or partition (determined by the window-order-clause) without having to use a self join. [Analytic functions]
- LDAP_LINK_DRYRUN_CONNECT
- Takes a set of LDAP Link connection parameters as arguments and begins a dry run connection between the LDAP server and Vertica. [LDAP link functions]
- LDAP_LINK_DRYRUN_SEARCH
- Takes a set of LDAP Link connection and search parameters as arguments and begins a dry run search for users and groups that would get imported from the LDAP server. [LDAP link functions]
- LDAP_LINK_DRYRUN_SYNC
- Takes a set of LDAP Link connection and search parameters as arguments and begins a dry run synchronization between the database and the LDAP server, which maps and synchronizes the LDAP server's users and groups with their equivalents in Vertica. [LDAP link functions]
- LDAP_LINK_SYNC_CANCEL
- Cancels in-progress LDAP Link synchronizations (including those started by LDAP_LINK_DRYRUN_SYNC) between the LDAP server and Vertica. [LDAP link functions]
- LDAP_LINK_SYNC_START
- Begins the synchronization between the LDAP server and Vertica immediately rather than waiting for the interval set in LDAPLinkInterval. [LDAP link functions]
- LEAD [analytic]
- Returns values from the row after the current row within a , letting you access more than one row in a table at the same time. [Analytic functions]
- LEAST
- Returns the smallest value in a list of expressions of any data type. [String functions]
- LEASTB
- Returns the smallest value in a list of expressions of any data type, using binary ordering. [String functions]
- LEFT
- Returns the specified characters from the left side of a string. [String functions]
- LENGTH
- Returns the length of a string. [String functions]
- LIFT_TABLE
- Returns a table that compares the predictive quality of a machine learning model. [Model evaluation]
- LINEAR_REG
- Executes linear regression on an input relation, and returns a linear regression model. [Machine learning algorithms]
- LIST_ENABLED_CIPHERS
- Returns a list of enabled cipher suites, which are sets of algorithms used to secure TLS/SSL connections. [System information functions]
- LISTAGG
- Transforms non-null values from a group of rows into a list of values that are delimited by commas (default) or a configurable separator. [Aggregate functions]
- LN
- Returns the natural logarithm of the argument. [Mathematical functions]
- LOCALTIME
- Returns a value of type TIME that represents the start of the current transaction. [Date/time functions]
- LOCALTIMESTAMP
- Returns a value of type TIMESTAMP/TIMESTAMPTZ that represents the start of the current transaction, and remains unchanged until the transaction is closed. [Date/time functions]
- LOG
- Returns the logarithm to the specified base of the argument. [Mathematical functions]
- LOG10
- Returns the base 10 logarithm of the argument, also known as the common logarithm. [Mathematical functions]
- LOGISTIC_REG
- Executes logistic regression on an input relation. [Machine learning algorithms]
- LOWER
- Takes a string value and returns a VARCHAR value converted to lowercase. [String functions]
- LOWERB
- Returns a character string with each ASCII character converted to lowercase. [String functions]
- LPAD
- Returns a VARCHAR value representing a string of a specific length filled on the left with specific characters. [String functions]
- LTRIM
- Returns a VARCHAR value representing a string with leading blanks removed from the left side (beginning). [String functions]

### M

- MAKE_AHM_NOW
- Sets the (AHM) to the greatest allowable value. [Epoch functions]
- MAKEUTF8
- Coerces a string to UTF-8 by removing or replacing non-UTF-8 characters. [String functions]
- MAPAGGREGATE
- Returns a LONG VARBINARY VMap with key and value pairs supplied from two VARCHAR input columns. [Flex map functions]
- MAPCONTAINSKEY
- Determines whether a VMap contains a virtual column (key). [Flex map functions]
- MAPCONTAINSVALUE
- Determines whether a VMap contains a specific value. [Flex map functions]
- MAPDELIMITEDEXTRACTOR
- Extracts data with a delimiter character and other optional arguments, returning a single VMap value. [Flex extractor functions]
- MAPITEMS
- Returns information about items in a VMap. [Flex map functions]
- MAPJSONEXTRACTOR
- Extracts content of repeated JSON data objects,, including nested maps, or data with an outer list of JSON elements. [Flex extractor functions]
- MAPKEYS
- Returns the virtual columns (and values) present in any VMap data. [Flex map functions]
- MAPKEYSINFO
- Returns virtual column information from a given map. [Flex map functions]
- MAPLOOKUP
- Returns single-key values from VMAP data. [Flex map functions]
- MAPPUT
- Accepts a VMap and one or more key/value pairs and returns a new VMap with the key/value pairs added. [Flex map functions]
- MAPREGEXEXTRACTOR
- Extracts data with a regular expression and returns results as a VMap. [Flex extractor functions]
- MAPSIZE
- Returns the number of virtual columns present in any VMap data. [Flex map functions]
- MAPTOSTRING
- Recursively builds a string representation of VMap data, including nested JSON maps. [Flex map functions]
- MAPVALUES
- Returns a string representation of the top-level values from a VMap. [Flex map functions]
- MAPVERSION
- Returns the version or invalidity of any map data. [Flex map functions]
- MARK_DESIGN_KSAFE
- Enables or disables high availability in your environment, in case of a failure. [Catalog functions]
- MATCH_COLUMNS
- Specified as an element in a SELECT list, returns all columns in queried tables that match the specified pattern. [Regular expression functions]
- MATCH_ID
- Returns a successful pattern match as an INTEGER value. [MATCH clause functions]
- MATERIALIZE_FLEXTABLE_COLUMNS
- Materializes virtual columns listed as key_names in the flextable_keys table you compute using either COMPUTE_FLEXTABLE_KEYS or COMPUTE_FLEXTABLE_KEYS_AND_BUILD_VIEW. [Flex data functions]
- MAX [aggregate]
- Returns the greatest value of an expression over a group of rows. [Aggregate functions]
- MAX [analytic]
- Returns the maximum value of an expression within a. [Analytic functions]
- MD5
- Calculates the MD5 hash of string, returning the result as a VARCHAR string in hexadecimal. [String functions]
- MEASURE_LOCATION_PERFORMANCE
- Measures a storage location's disk performance. [Storage functions]
- MEDIAN [analytic]
- For each row, returns the median value of a value set within each partition. [Analytic functions]
- MEMORY_TRIM
- Calls glibc function malloc_trim() to reclaim free memory from malloc and return it to the operating system. [Database functions]
- MICROSECOND
- Returns the microsecond portion of the specified date as an integer. [Date/time functions]
- MIDNIGHT_SECONDS
- Within the specified date, returns the number of seconds between midnight and the date's time portion. [Date/time functions]
- MIGRATE_ENTERPRISE_TO_EON
- Migrates an Enterprise database to an Eon Mode database. [Eon Mode functions]
- MIN [aggregate]
- Returns the smallest value of an expression over a group of rows. [Aggregate functions]
- MIN [analytic]
- Returns the minimum value of an expression within a. [Analytic functions]
- MINUTE
- Returns the minute portion of the specified date as an integer. [Date/time functions]
- MOD
- Returns the remainder of a division operation. [Mathematical functions]
- MONTH
- Returns the month portion of the specified date as an integer. [Date/time functions]
- MONTHS_BETWEEN
- Returns the number of months between two dates. [Date/time functions]
- MOVE_PARTITIONS_TO_TABLE
- Moves partitions from one table to another. [Partition functions]
- MOVE_RETIRED_LOCATION_DATA
- Moves all data from the specified retired storage location or from all retired storage locations in the database. [Storage functions]
- MOVE_STATEMENT_TO_RESOURCE_POOL
- Attempts to move the specified query to the specified target pool. [Workload management functions]
- MOVING_AVERAGE
- Creates a moving-average (MA) model from a stationary time series with consistent timesteps that can then be used for prediction via PREDICT_MOVING_AVERAGE. [Machine learning algorithms]
- MSE
- Returns a table that displays the mean squared error of the prediction and response columns in a machine learning model. [Model evaluation]

### N

- NAIVE_BAYES
- Executes the Naive Bayes algorithm on an input relation and returns a Naive Bayes model. [Machine learning algorithms]
- NEW_TIME
- Converts a timestamp value from one time zone to another and returns a TIMESTAMP. [Date/time functions]
- NEXT_DAY
- Returns the date of the first instance of a particular day of the week that follows the specified date. [Date/time functions]
- NEXTVAL
- Returns the next value in a sequence. [Sequence functions]
- NORMALIZE
- Runs a normalization algorithm on an input relation. [Data preparation]
- NORMALIZE_FIT
- This function differs from NORMALIZE, which directly outputs a view with normalized results, rather than storing normalization parameters into a model for later operation. [Data preparation]
- NOTIFY
- Sends a specified message to a NOTIFIER. [Notifier functions]
- NOW [date/time]
- Returns a value of type TIMESTAMP WITH TIME ZONE representing the start of the current transaction. [Date/time functions]
- NTH_VALUE [analytic]
- Returns the value evaluated at the row that is the nth row of the window (counting from 1). [Analytic functions]
- NTILE [analytic]
- Equally divides an ordered data set (partition) into a {value} number of subsets within a , where the subsets are numbered 1 through the value in parameter constant-value. [Analytic functions]
- NULLIF
- Compares two expressions. [NULL-handling functions]
- NULLIFZERO
- Evaluates to NULL if the value in the column is 0. [NULL-handling functions]
- NVL
- Returns the value of the first non-null expression in the list. [NULL-handling functions]
- NVL2
- Takes three arguments. [NULL-handling functions]

### O

- OCTET_LENGTH
- Takes one argument as an input and returns the string length in octets for all string types. [String functions]
- ONE_HOT_ENCODER_FIT
- Generates a sorted list of each of the category levels for each feature to be encoded, and stores the model. [Data preparation]
- OVERLAPS
- Evaluates two time periods and returns true when they overlap, false otherwise. [Date/time functions]
- OVERLAY
- Replaces part of a string with another string and returns the new string value as a VARCHAR. [String functions]
- OVERLAYB
- Replaces part of a string with another string and returns the new string as an octet value. [String functions]

### P

- PARTITION_PROJECTION
- Splits containers for a specified projection. [Partition functions]
- PARTITION_TABLE
- Invokes the to reorganize ROS storage containers as needed to conform with the current partitioning policy. [Partition functions]
- PATTERN_ID
- Returns an integer value that is a partition-wide unique identifier for the instance of the pattern that matched. [MATCH clause functions]
- PCA
- Computes principal components from the input table/view. [Data preparation]
- PERCENT_RANK [analytic]
- Calculates the relative rank of a row for a given row in a group within a by dividing that row’s rank less 1 by the number of rows in the partition, also less 1. [Analytic functions]
- PERCENTILE_CONT [analytic]
- An inverse distribution function where, for each row, PERCENTILE_CONT returns the value that would fall into the specified percentile among a set of values in each partition within a. [Analytic functions]
- PERCENTILE_DISC [analytic]
- An inverse distribution function where, for each row, PERCENTILE_DISC returns the value that would fall into the specified percentile among a set of values in each partition within a. [Analytic functions]
- PI
- Returns the constant pi (P), the ratio of any circle's circumference to its diameter in Euclidean geometry The return type is DOUBLE PRECISION. [Mathematical functions]
- POISSON_REG
- Executes Poisson regression on an input relation, and returns a Poisson regression model. [Machine learning algorithms]
- POSITION
- Returns an INTEGER value representing the character location of a specified substring with a string (counting from one). [String functions]
- POSITIONB
- Returns an INTEGER value representing the octet location of a specified substring with a string (counting from one). [String functions]
- POWER
- Returns a DOUBLE PRECISION value representing one number raised to the power of another number. [Mathematical functions]
- PRC
- Returns a table that displays the points on a receiver precision recall (PR) curve. [Model evaluation]
- PREDICT_ARIMA
- Applies an autoregressive integrated moving average (ARIMA) model to an input relation or makes predictions using the in-sample data. [Transformation functions]
- PREDICT_AUTOREGRESSOR
- Applies an autoregressor (AR) model to an input relation. [Transformation functions]
- PREDICT_LINEAR_REG
- Applies a linear regression model on an input relation and returns the predicted value as a FLOAT. [Transformation functions]
- PREDICT_LOGISTIC_REG
- Applies a logistic regression model on an input relation. [Transformation functions]
- PREDICT_MOVING_AVERAGE
- Applies a moving-average (MA) model, created by MOVING_AVERAGE, to an input relation. [Transformation functions]
- PREDICT_NAIVE_BAYES
- Applies a Naive Bayes model on an input relation. [Transformation functions]
- PREDICT_NAIVE_BAYES_CLASSES
- Applies a Naive Bayes model on an input relation and returns the probabilities of classes:. [Transformation functions]
- PREDICT_PMML
- Applies an imported PMML model on an input relation. [Transformation functions]
- PREDICT_POISSON_REG
- Applies a Poisson regression model on an input relation and returns the predicted value as a FLOAT. [Transformation functions]
- PREDICT_RF_CLASSIFIER
- Applies a random forest model on an input relation. [Transformation functions]
- PREDICT_RF_CLASSIFIER_CLASSES
- Applies a random forest model on an input relation and returns the probabilities of classes:. [Transformation functions]
- PREDICT_RF_REGRESSOR
- Applies a random forest model on an input relation, and returns with a FLOAT data type that specifies the predicted value of the random forest model—the average of the prediction of the trees in the forest. [Transformation functions]
- PREDICT_SVM_CLASSIFIER
- Uses an SVM model to predict class labels for samples in an input relation, and returns the predicted value as a FLOAT data type. [Transformation functions]
- PREDICT_SVM_REGRESSOR
- Uses an SVM model to perform regression on samples in an input relation, and returns the predicted value as a FLOAT data type. [Transformation functions]
- PREDICT_TENSORFLOW
- Applies a TensorFlow model on an input relation, and returns with the result expected for the encoded model type. [Transformation functions]
- PREDICT_XGB_CLASSIFIER
- Applies an XGBoost classifier model on an input relation. [Transformation functions]
- PREDICT_XGB_CLASSIFIER_CLASSES
- Applies an XGBoost classifier model on an input relation and returns the probabilities of classes:. [Transformation functions]
- PREDICT_XGB_REGRESSOR
- Applies an XGBoost regressor model on an input relation. [Transformation functions]
- PROMOTE_SUBCLUSTER_TO_PRIMARY
- Converts a secondary subcluster to a. [Eon Mode functions]
- PURGE
- Permanently removes delete vectors from ROS storage containers so disk space can be reused. [Database functions]
- PURGE_PARTITION
- Purges a table partition of deleted rows. [Partition functions]
- PURGE_PROJECTION
- PURGE_PROJECTION can use significant disk space while purging the data. [Projection functions]
- PURGE_TABLE
- This function was formerly named PURGE_TABLE_PROJECTIONS(). [Table functions]

### Q

- QUARTER
- Returns calendar quarter of the specified date as an integer, where the January-March quarter is 1. [Date/time functions]
- QUOTE_IDENT
- Returns the specified string argument in the format required to use the string as an identifier in an SQL statement. [String functions]
- QUOTE_LITERAL
- Returns the given string suitably quoted for use as a string literal in a SQL statement string. [String functions]
- QUOTE_NULLABLE
- Returns the given string suitably quoted for use as a string literal in an SQL statement string; or if the argument is null, returns the unquoted string NULL. [String functions]

### R

- RADIANS
- Returns a DOUBLE PRECISION value representing an angle expressed in radians. [Mathematical functions]
- RANDOM
- Returns a uniformly-distributed random DOUBLE PRECISION value x, where 0 <= x < 1. [Mathematical functions]
- RANDOMINT
- Accepts and returns an integer between 0 and the integer argument expression-1. [Mathematical functions]
- RANDOMINT_CRYPTO
- Accepts and returns an INTEGER value from a set of values between 0 and the specified function argument -1. [Mathematical functions]
- RANK [analytic]
- Within each window partition, ranks all rows in the query results set according to the order specified by the window's ORDER BY clause. [Analytic functions]
- READ_CONFIG_FILE
- Reads and returns the key-value pairs of all the parameters of a given tokenizer. [Text search functions]
- READ_TREE
- Reads the contents of trees within the random forest or XGBoost model. [Model evaluation]
- REALIGN_CONTROL_NODES
- Causes Vertica to re-evaluate which nodes in the cluster or subcluster are and which nodes are assigned to them as dependents when large cluster is enabled. [Cluster functions]
- REBALANCE_CLUSTER
- Rebalances the database cluster synchronously as a session foreground task. [Cluster functions]
- REBALANCE_SHARDS
- Rebalances shard assignments in a subcluster or across the entire cluster in Eon Mode. [Eon Mode functions]
- REBALANCE_TABLE
- Synchronously rebalances data in the specified table. [Table functions]
- REENABLE_DUPLICATE_KEY_ERROR
- Restores the default behavior of error reporting by reversing the effects of DISABLE_DUPLICATE_KEY_ERROR. [Table functions]
- REFRESH
- Synchronously refreshes one or more table projections in the foreground, and updates the PROJECTION_REFRESHES system table. [Projection functions]
- REFRESH_COLUMNS
- Refreshes table columns that are defined with the constraint SET USING or DEFAULT USING. [Projection functions]
- REGEXP_COUNT
- Returns the number times a regular expression matches a string. [Regular expression functions]
- REGEXP_ILIKE
- Returns true if the string contains a match for the regular expression. [Regular expression functions]
- REGEXP_INSTR
- Returns the starting or ending position in a string where a regular expression matches. [Regular expression functions]
- REGEXP_LIKE
- Returns true if the string matches the regular expression. [Regular expression functions]
- REGEXP_NOT_ILIKE
- Returns true if the string does not match the case-insensitive regular expression. [Regular expression functions]
- REGEXP_NOT_LIKE
- Returns true if the string does not contain a match for the regular expression. [Regular expression functions]
- REGEXP_REPLACE
- Replaces all occurrences of a substring that match a regular expression with another substring. [Regular expression functions]
- REGEXP_SUBSTR
- Returns the substring that matches a regular expression within a string. [Regular expression functions]
- REGISTER_MODEL
- Registers a trained model and adds it to Model Versioning environment with a status of 'under_review'. [Model management]
- REGR_AVGX
- Returns the DOUBLE PRECISION average of the independent expression in an expression pair. [Aggregate functions]
- REGR_AVGY
- Returns the DOUBLE PRECISION average of the dependent expression in an expression pair. [Aggregate functions]
- REGR_COUNT
- Returns the count of all rows in an expression pair. [Aggregate functions]
- REGR_INTERCEPT
- Returns the y-intercept of the regression line determined by a set of expression pairs. [Aggregate functions]
- REGR_R2
- Returns the square of the correlation coefficient of a set of expression pairs. [Aggregate functions]
- REGR_SLOPE
- Returns the slope of the regression line, determined by a set of expression pairs. [Aggregate functions]
- REGR_SXX
- Returns the sum of squares of the difference between the independent expression (expression2) and its average. [Aggregate functions]
- REGR_SXY
- Returns the sum of products of the difference between the dependent expression (expression1) and its average and the difference between the independent expression (expression2) and its average. [Aggregate functions]
- REGR_SYY
- Returns the sum of squares of the difference between the dependent expression (expression1) and its average. [Aggregate functions]
- RELEASE_ALL_JVM_MEMORY
- Forces all sessions to release the memory consumed by their Java Virtual Machines (JVM). [Session functions]
- RELEASE_JVM_MEMORY
- Terminates a Java Virtual Machine (JVM), making available the memory the JVM was using. [Session functions]
- RELEASE_SYSTEM_TABLES_ACCESS
- Enables non-superuser access to all system tables. [Privileges and access functions]
- RELOAD_ADMINTOOLS_CONF
- Updates the admintools.conf on each UP node in the cluster. [Catalog functions]
- RELOAD_SPREAD
- Updates cluster changes to the catalog's Spread configuration file. [Cluster functions]
- REPEAT
- Replicates a string the specified number of times and concatenates the replicated values as a single string. [String functions]
- REPLACE
- Replaces all occurrences of characters in a string with another set of characters. [String functions]
- RESERVE_SESSION_RESOURCE
- Reserves memory resources from the general resource pool for the exclusive use of the Vertica backup and restore process. [Session functions]
- RESET_LOAD_BALANCE_POLICY
- Resets the counter each host in the cluster maintains, to track which host it will refer a client to when the native connection load balancing scheme is set to ROUNDROBIN. [Client connection functions]
- RESET_SESSION
- Applies your default connection string configuration settings to your current session. [Session functions]
- RESHARD_DATABASE
- Changes the number of shards in a database. [Eon Mode functions]
- RESTORE_FLEXTABLE_DEFAULT_KEYS_TABLE_AND_VIEW
- Restores the keys table and the view. [Flex data functions]
- RESTORE_LOCATION
- Restores a storage location that was previously retired with RETIRE_LOCATION. [Storage functions]
- RESTRICT_SYSTEM_TABLES_ACCESS
- Checks system table SYSTEM_TABLES to determine which system tables non-superusers can access. [Privileges and access functions]
- RETIRE_LOCATION
- Deactivates the specified storage location. [Storage functions]
- REVERSE_NORMALIZE
- Reverses the normalization transformation on normalized data, thereby de-normalizing the normalized data. [Transformation functions]
- RF_CLASSIFIER
- Trains a random forest model for classification on an input relation. [Machine learning algorithms]
- RF_PREDICTOR_IMPORTANCE
- Measures the importance of the predictors in a random forest model using the Mean Decrease Impurity (MDI) approach. [Model evaluation]
- RF_REGRESSOR
- Trains a random forest model for regression on an input relation. [Machine learning algorithms]
- RIGHT
- Returns the specified characters from the right side of a string. [String functions]
- ROC
- Returns a table that displays the points on a receiver operating characteristic curve. [Model evaluation]
- ROUND
- Rounds the specified date or time. [Date/time functions]
- ROUND
- Rounds a value to a specified number of decimal places, retaining the original precision and scale. [Mathematical functions]
- ROW_NUMBER [analytic]
- Assigns a sequence of unique numbers to each row in a partition, starting with 1. [Analytic functions]
- RPAD
- Returns a VARCHAR value representing a string of a specific length filled on the right with specific characters. [String functions]
- RSQUARED
- Returns a table with the R-squared value of the predictions in a regression model. [Model evaluation]
- RTRIM
- Returns a VARCHAR value representing a string with trailing blanks removed from the right side (end). [String functions]
- RUN_INDEX_TOOL
- Runs the Index tool on a Vertica database to perform one of these tasks:. [Database functions]

### S

- SANDBOX_SUBCLUSTER
- Creates a sandbox for a secondary subcluster. [Eon Mode functions]
- SAVE_PLANS
- Creates optimizer-generated directed queries from the most frequently executed queries, up to the maximum specified. [Directed queries functions]
- SECOND
- Returns the seconds portion of the specified date as an integer. [Date/time functions]
- SECURITY_CONFIG_CHECK
- Returns the status of various security-related parameters. [Database functions]
- SESSION_USER
- Returns a VARCHAR containing the name of the user who initiated the current database session. [System information functions]
- SET_AHM_EPOCH
- Sets the (AHM) to the specified epoch. [Epoch functions]
- SET_AHM_TIME
- Sets the (AHM) to the epoch corresponding to the specified time on the initiator node. [Epoch functions]
- SET_AUDIT_TIME
- Sets the time that Vertica performs automatic database size audit to determine if the size of the database is compliant with the raw data allowance in your Vertica license. [License functions]
- SET_CLIENT_LABEL
- Assigns a label to a client connection for the current session. [Client connection functions]
- SET_CONFIG_PARAMETER
- Sets or clears a configuration parameter at the specified level. [Database functions]
- SET_CONTROL_SET_SIZE
- Sets the number of that participate in the spread service when large cluster is enabled. [Cluster functions]
- SET_DATA_COLLECTOR_NOTIFY_POLICY
- Creates/enables notification policies for a component. [Notifier functions]
- SET_DATA_COLLECTOR_POLICY
- Updates the following retention policy properties for the specified component:. [Data collector functions]
- SET_DATA_COLLECTOR_TIME_POLICY
- Updates the retention policy property INTERVAL_TIME for the specified component. [Data collector functions]
- SET_DEPOT_PIN_POLICY_PARTITION
- Pins the specified partitions of a table or projection to a subcluster depot, or all database depots, to reduce exposure to depot eviction. [Eon Mode functions]
- SET_DEPOT_PIN_POLICY_PROJECTION
- Pins a projection to a subcluster depot, or all database depots, to reduce its exposure to depot eviction. [Eon Mode functions]
- SET_DEPOT_PIN_POLICY_TABLE
- Pins a table to a subcluster depot, or all database depots, to reduce its exposure to depot eviction. [Eon Mode functions]
- SET_LOAD_BALANCE_POLICY
- Sets how native connection load balancing chooses a host to handle a client connection. [Client connection functions]
- SET_LOCATION_PERFORMANCE
- Sets disk performance for a storage location. [Storage functions]
- SET_OBJECT_STORAGE_POLICY
- Creates or changes the storage policy of a database object by assigning it a labeled storage location. [Storage functions]
- SET_SCALING_FACTOR
- Sets the scaling factor that determines the number of storage containers used when rebalancing the database and when using local data segmentation is enabled. [Cluster functions]
- SET_SPREAD_OPTION
- Changes daemon settings. [Database functions]
- SET_TOKENIZER_PARAMETER
- Configures the tokenizer parameters. [Text search functions]
- SET_UNION
- Returns a SET containing all elements of two input sets. [Collection functions]
- SHA1
- Uses the US Secure Hash Algorithm 1 to calculate the SHA1 hash of string. [String functions]
- SHA224
- Uses the US Secure Hash Algorithm 2 to calculate the SHA224 hash of string. [String functions]
- SHA256
- Uses the US Secure Hash Algorithm 2 to calculate the SHA256 hash of string. [String functions]
- SHA384
- Uses the US Secure Hash Algorithm 2 to calculate the SHA384 hash of string. [String functions]
- SHA512
- Uses the US Secure Hash Algorithm 2 to calculate the SHA512 hash of string. [String functions]
- SHOW_PROFILING_CONFIG
- Shows whether profiling is enabled. [Profiling functions]
- SHUTDOWN
- Shuts down a Vertica database. [Database functions]
- SHUTDOWN_SUBCLUSTER
- Shuts down a subcluster. [Eon Mode functions]
- SHUTDOWN_WITH_DRAIN
- Gracefully shuts down a subcluster or subclusters. [Eon Mode functions]
- SIGN
- Returns a DOUBLE PRECISION value of -1, 0, or 1 representing the arithmetic sign of the argument. [Mathematical functions]
- SIN
- Returns a DOUBLE PRECISION value that represents the trigonometric sine of the passed parameter. [Mathematical functions]
- SINH
- Returns a DOUBLE PRECISION value that represents the hyperbolic sine of the passed parameter. [Mathematical functions]
- SLEEP
- Waits a specified number of seconds before executing another statement or command. [Workload management functions]
- SOUNDEX
- Takes a VARCHAR argument and returns a four-character code that enables comparison of that argument with other SOUNDEX-encoded strings that are spelled differently in English, but are phonetically similar. [String functions]
- SOUNDEX_MATCHES
- Compares the Soundex encodings of two strings. [String functions]
- SPACE
- Returns the specified number of blank spaces, typically for insertion into a character string. [String functions]
- SPLIT_PART
- Splits string on the delimiter and returns the string at the location of the beginning of the specified field (counting from 1). [String functions]
- SPLIT_PARTB
- Divides an input string on a delimiter character and returns the Nth segment, counting from 1. [String functions]
- SQRT
- Returns a DOUBLE PRECISION value representing the arithmetic square root of the argument. [Mathematical functions]
- ST_Area
- Calculates the area of a spatial object. [Geospatial functions]
- ST_AsBinary
- Creates the Well-Known Binary (WKB) representation of a spatial object. [Geospatial functions]
- ST_AsText
- Creates the Well-Known Text (WKT) representation of a spatial object. [Geospatial functions]
- ST_Boundary
- Calculates the boundary of the specified GEOMETRY object. [Geospatial functions]
- ST_Buffer
- Creates a GEOMETRY object greater than or equal to a specified distance from the boundary of a spatial object. [Geospatial functions]
- ST_Centroid
- Calculates the geometric center—the centroid—of a spatial object. [Geospatial functions]
- ST_Contains
- Determines if a spatial object is entirely inside another spatial object without existing only on its boundary. [Geospatial functions]
- ST_ConvexHull
- Calculates the smallest convex GEOMETRY object that contains a GEOMETRY object. [Geospatial functions]
- ST_Crosses
- Determines if one GEOMETRY object spatially crosses another GEOMETRY object. [Geospatial functions]
- ST_Difference
- Calculates the part of a spatial object that does not intersect with another spatial object. [Geospatial functions]
- ST_Disjoint
- Determines if two GEOMETRY objects do not intersect or touch. [Geospatial functions]
- ST_Distance
- Calculates the shortest distance between two spatial objects. [Geospatial functions]
- ST_Envelope
- Calculates the minimum bounding rectangle that contains the specified GEOMETRY object. [Geospatial functions]
- ST_Equals
- Determines if two spatial objects are spatially equivalent. [Geospatial functions]
- ST_GeographyFromText
- Converts a Well-Known Text (WKT) string into its corresponding GEOGRAPHY object. [Geospatial functions]
- ST_GeographyFromWKB
- Converts a Well-Known Binary (WKB) value into its corresponding GEOGRAPHY object. [Geospatial functions]
- ST_GeoHash
- Returns a GeoHash in the shape of the specified geometry. [Geospatial functions]
- ST_GeometryN
- Returns the n geometry within a geometry object. [Geospatial functions]
- ST_GeometryType
- Determines the class of a spatial object. [Geospatial functions]
- ST_GeomFromGeoHash
- Returns a polygon in the shape of the specified GeoHash. [Geospatial functions]
- ST_GeomFromGeoJSON
- Converts the geometry portion of a GeoJSON record in the standard format into a GEOMETRY object. [Geospatial functions]
- ST_GeomFromText
- Converts a Well-Known Text (WKT) string into its corresponding GEOMETRY object. [Geospatial functions]
- ST_GeomFromWKB
- Converts the Well-Known Binary (WKB) value to its corresponding GEOMETRY object. [Geospatial functions]
- ST_Intersection
- Calculates the set of points shared by two GEOMETRY objects. [Geospatial functions]
- ST_Intersects
- Determines if two GEOMETRY or GEOGRAPHY objects intersect or touch at a single point. [Geospatial functions]
- ST_IsEmpty
- Determines if a spatial object represents the empty set. [Geospatial functions]
- ST_IsSimple
- Determines if a spatial object does not intersect itself or touch its own boundary at any point. [Geospatial functions]
- ST_IsValid
- Determines if a spatial object is well formed or valid. [Geospatial functions]
- ST_Length
- Calculates the length of a spatial object. [Geospatial functions]
- ST_NumGeometries
- Returns the number of geometries contained within a spatial object. [Geospatial functions]
- ST_NumPoints
- Calculates the number of vertices of a spatial object, empty objects return NULL. [Geospatial functions]
- ST_Overlaps
- Determines if a GEOMETRY object shares space with another GEOMETRY object, but is not completely contained within that object. [Geospatial functions]
- ST_PointFromGeoHash
- Returns the center point of the specified GeoHash. [Geospatial functions]
- ST_PointN
- Finds the n point of a spatial object. [Geospatial functions]
- ST_Relate
- Determines if a given GEOMETRY object is spatially related to another GEOMETRY object, based on the specified DE-9IM pattern matrix string. [Geospatial functions]
- ST_SRID
- Identifies the spatial reference system identifier (SRID) stored with a spatial object. [Geospatial functions]
- ST_SymDifference
- Calculates all the points in two GEOMETRY objects except for the points they have in common, but including the boundaries of both objects. [Geospatial functions]
- ST_Touches
- Determines if two GEOMETRY objects touch at a single point or along a boundary, but do not have interiors that intersect. [Geospatial functions]
- ST_Transform
- Returns a new GEOMETRY with its coordinates converted to the spatial reference system identifier (SRID) used by the srid argument. [Geospatial functions]
- ST_Union
- Calculates the union of all points in two spatial objects. [Geospatial functions]
- ST_Within
- If spatial object g1 is completely inside of spatial object g2, then ST_Within returns true. [Geospatial functions]
- ST_X
- Determines the x- coordinate for a GEOMETRY point or the longitude value for a GEOGRAPHY point. [Geospatial functions]
- ST_XMax
- Returns the maximum x-coordinate of the minimum bounding rectangle of the GEOMETRY or GEOGRAPHY object. [Geospatial functions]
- ST_XMin
- Returns the minimum x-coordinate of the minimum bounding rectangle of the GEOMETRY or GEOGRAPHY object. [Geospatial functions]
- ST_Y
- Determines the y-coordinate for a GEOMETRY point or the latitude value for a GEOGRAPHY point. [Geospatial functions]
- ST_YMax
- Returns the maximum y-coordinate of the minimum bounding rectangle of the GEOMETRY or GEOGRAPHY object. [Geospatial functions]
- ST_YMin
- Returns the minimum y-coordinate of the minimum bounding rectangle of the GEOMETRY or GEOGRAPHY object. [Geospatial functions]
- START_DRAIN_SUBCLUSTER
- Drains a subcluster or subclusters. [Eon Mode functions]
- START_REAPING_FILES
- Starts the disk file deletion in the background as an asynchronous function. [Eon Mode functions]
- START_REBALANCE_CLUSTER
- Asynchronously rebalances the database cluster as a background task. [Cluster functions]
- START_REFRESH
- Refreshes projections in the current schema with the latest data of their respective. [Projection functions]
- STATEMENT_TIMESTAMP
- Similar to TRANSACTION_TIMESTAMP, returns a value of type TIMESTAMP WITH TIME ZONE that represents the start of the current statement. [Date/time functions]
- STDDEV [aggregate]
- Evaluates the statistical sample standard deviation for each member of the group. [Aggregate functions]
- STDDEV [analytic]
- Computes the statistical sample standard deviation of the current row with respect to the group within a. [Analytic functions]
- STDDEV_POP [aggregate]
- Evaluates the statistical population standard deviation for each member of the group. [Aggregate functions]
- STDDEV_POP [analytic]
- Evaluates the statistical population standard deviation for each member of the group. [Analytic functions]
- STDDEV_SAMP [aggregate]
- Evaluates the statistical sample standard deviation for each member of the group. [Aggregate functions]
- STDDEV_SAMP [analytic]
- Computes the statistical sample standard deviation of the current row with respect to the group within a. [Analytic functions]
- STRING_TO_ARRAY
- Splits a string containing array values and returns a native one-dimensional array. [Collection functions]
- STRPOS
- Returns an INTEGER value that represents the location of a specified substring within a string (counting from one). [String functions]
- STRPOSB
- Returns an INTEGER value representing the location of a specified substring within a string, counting from one, where each octet in the string is counted (as opposed to characters). [String functions]
- STV_AsGeoJSON
- Returns the geometry or geography argument as a Geometry Javascript Object Notation (GeoJSON) object. [Geospatial functions]
- STV_Create_Index
- Creates a spatial index on a set of polygons to speed up spatial intersection with a set of points. [Geospatial functions]
- STV_Describe_Index
- Retrieves information about an index that contains a set of polygons. [Geospatial functions]
- STV_Drop_Index
- Deletes a spatial index. [Geospatial functions]
- STV_DWithin
- Determines if the shortest distance from the boundary of one spatial object to the boundary of another object is within a specified distance. [Geospatial functions]
- STV_Export2Shapefile
- Exports GEOGRAPHY or GEOMETRY data from a database table or a subquery to a shapefile. [Geospatial functions]
- STV_Extent
- Returns a bounding box containing all of the input data. [Geospatial functions]
- STV_ForceLHR
- Alters the order of the vertices of a spatial object to follow the left-hand-rule. [Geospatial functions]
- STV_Geography
- Casts a GEOMETRY object into a GEOGRAPHY object. [Geospatial functions]
- STV_GeographyPoint
- Returns a GEOGRAPHY point based on the input values. [Geospatial functions]
- STV_Geometry
- Casts a GEOGRAPHY object into a GEOMETRY object. [Geospatial functions]
- STV_GeometryPoint
- Returns a GEOMETRY point, based on the input values. [Geospatial functions]
- STV_GetExportShapefileDirectory
- Returns the path of the export directory. [Geospatial functions]
- STV_Intersect scalar function
- Spatially intersects a point or points with a set of polygons. [Geospatial functions]
- STV_Intersect transform function
- Spatially intersects points and polygons. [Geospatial functions]
- STV_IsValidReason
- Determines if a spatial object is well formed or valid. [Geospatial functions]
- STV_LineStringPoint
- Retrieves the vertices of a linestring or multilinestring. [Geospatial functions]
- STV_MemSize
- Returns the length of the spatial object in bytes as an INTEGER. [Geospatial functions]
- STV_NN
- Calculates the distance of spatial objects from a reference object and returns (object, distance) pairs in ascending order by distance from the reference object. [Geospatial functions]
- STV_PolygonPoint
- Retrieves the vertices of a polygon as individual points. [Geospatial functions]
- STV_Refresh_Index
- Appends newly added or updated polygons and removes deleted polygons from an existing spatial index. [Geospatial functions]
- STV_Rename_Index
- Renames a spatial index. [Geospatial functions]
- STV_Reverse
- Reverses the order of the vertices of a spatial object. [Geospatial functions]
- STV_SetExportShapefileDirectory
- Specifies the directory to export GEOMETRY or GEOGRAPHY data to a shapefile. [Geospatial functions]
- STV_ShpCreateTable
- Returns a CREATE TABLE statement with the columns and types of the attributes found in the specified shapefile. [Geospatial functions]
- STV_ShpSource and STV_ShpParser
- These two functions work with COPY to parse and load geometries and attributes from a shapefile into a Vertica table, and convert them to the appropriate GEOMETRY data type. [Geospatial functions]
- SUBSTR
- Returns VARCHAR or VARBINARY value representing a substring of a specified string. [String functions]
- SUBSTRB
- Returns an octet value representing the substring of a specified string. [String functions]
- SUBSTRING
- Returns a value representing a substring of the specified string at the given position, given a value, a position, and an optional length. [String functions]
- SUM [aggregate]
- Computes the sum of an expression over a group of rows. [Aggregate functions]
- SUM [analytic]
- Computes the sum of an expression over a group of rows within a. [Analytic functions]
- SUM_FLOAT [aggregate]
- Computes the sum of an expression over a group of rows and returns a DOUBLE PRECISION value. [Aggregate functions]
- SUMMARIZE_CATCOL
- Returns a statistical summary of categorical data input, in three columns:. [Data preparation]
- SUMMARIZE_NUMCOL
- Returns a statistical summary of columns in a Vertica table:. [Data preparation]
- SVD
- Computes singular values (the diagonal of the S matrix) and right singular vectors (the V matrix) of an SVD decomposition of the input relation. [Data preparation]
- SVM_CLASSIFIER
- Trains the SVM model on an input relation. [Machine learning algorithms]
- SVM_REGRESSOR
- Trains the SVM model on an input relation. [Machine learning algorithms]
- SWAP_PARTITIONS_BETWEEN_TABLES
- Swaps partitions between two tables. [Partition functions]
- SYNC_CATALOG
- Synchronizes the catalog to communal storage to enable reviving the current catalog version in the case of an imminent crash. [Eon Mode functions]
- SYNC_WITH_HCATALOG_SCHEMA
- Copies the structure of a Hive database schema available through the HCatalog Connector to a Vertica schema. [Hadoop functions]
- SYNC_WITH_HCATALOG_SCHEMA_TABLE
- Copies the structure of a single table in a Hive database schema available through the HCatalog Connector to a Vertica table. [Hadoop functions]
- SYSDATE
- Returns the current statement's start date and time as a TIMESTAMP value. [Date/time functions]

### T

- TAN
- Returns a DOUBLE PRECISION value that represents the trigonometric tangent of the passed parameter. [Mathematical functions]
- TANH
- Returns a DOUBLE PRECISION value that represents the hyperbolic tangent of the passed parameter. [Mathematical functions]
- Template patterns for date/time formatting
- In an output template string (for TO_CHAR), certain patterns are recognized and replaced with appropriately formatted data from the value to format. [Formatting functions]
- Template patterns for numeric formatting
- A sign formatted using SG, PL, or MI is not anchored to the number. [Formatting functions]
- THROW_ERROR
- Returns a user-defined error message. [Error-handling functions]
- TIME_SLICE
- Aggregates data by different fixed-time intervals and returns a rounded-up input TIMESTAMP value to a value that corresponds with the start or end of the time slice interval. [Date/time functions]
- TIMEOFDAY
- Returns the wall-clock time as a text string. [Date/time functions]
- TIMESTAMP_ROUND
- Rounds the specified TIMESTAMP. [Date/time functions]
- TIMESTAMP_TRUNC
- Truncates the specified TIMESTAMP. [Date/time functions]
- TIMESTAMPADD
- Adds the specified number of intervals to a TIMESTAMP or TIMESTAMPTZ value and returns a result of the same data type. [Date/time functions]
- TIMESTAMPDIFF
- Returns the time span between two TIMESTAMP or TIMESTAMPTZ values, in the intervals specified. [Date/time functions]
- TO_BITSTRING
- This topic is shared in two locations: Formatting Functions and String Functions. [Formatting functions]
- TO_CHAR
- Converts date/time and numeric values into text strings. [Formatting functions]
- TO_DATE
- This topic shared in two places: Date/Time functions and Formatting Functions. [Formatting functions]
- TO_HEX
- This topic is shared in two locations: Formatting Functions and String Functions. [Formatting functions]
- TO_JSON
- Returns the JSON representation of a complex-type argument, including mixed and nested complex types. [Collection functions]
- TO_NUMBER
- Converts a string value to DOUBLE PRECISION. [Formatting functions]
- TO_TIMESTAMP
- Converts a string value or a UNIX/POSIX epoch value to a TIMESTAMP type. [Formatting functions]
- TO_TIMESTAMP_TZ
- Converts a string value or a UNIX/POSIX epoch value to a TIMESTAMP WITH TIME ZONE type. [Formatting functions]
- TRANSACTION_TIMESTAMP
- Returns a value of type TIME WITH TIMEZONE that represents the start of the current transaction. [Date/time functions]
- TRANSLATE
- Replaces individual characters in string_to_replace with other characters. [String functions]
- TRIM
- Combines the BTRIM, LTRIM, and RTRIM functions into a single function. [String functions]
- TRUNC
- Truncates the specified date or time. [Date/time functions]
- TRUNC
- Returns the expression value fully truncated (toward zero). [Mathematical functions]
- TS_FIRST_VALUE
- Processes the data that belongs to each time slice. [Aggregate functions]
- TS_LAST_VALUE
- Processes the data that belongs to each time slice. [Aggregate functions]

### U

- UNNEST
- Expands the elements of one or more collection columns (ARRAY or SET) into individual rows. [Collection functions]
- UNSANDBOX_SUBCLUSTER
- Removes a subcluster from a sandbox. [Eon Mode functions]
- UPGRADE_MODEL
- Upgrades a model from a previous Vertica version. [Model management]
- UPPER
- Returns a VARCHAR value containing the argument converted to uppercase letters. [String functions]
- UPPERB
- Returns a character string with each ASCII character converted to uppercase. [String functions]
- URI_PERCENT_DECODE
- Decodes a percent-encoded Universal Resource Identifier (URI) according to the RFC 3986 standard. [URI functions]
- URI_PERCENT_ENCODE
- Encodes a Universal Resource Identifier (URI) according to the RFC 3986 standard for percent encoding. [URI functions]
- USER
- Returns a VARCHAR containing the name of the user who initiated the current database connection. [System information functions]
- USERNAME
- Returns a VARCHAR containing the name of the user who initiated the current database connection. [System information functions]
- UUID_GENERATE
- Returns a new universally unique identifier (UUID) that is generated based on high-quality randomness from /dev/urandom. [UUID functions]

### V

- V6_ATON
- Converts a string containing a colon-delimited IPv6 network address into a VARBINARY string. [IP address functions]
- V6_NTOA
- Converts an IPv6 address represented as varbinary to a character string. [IP address functions]
- V6_SUBNETA
- Returns a VARCHAR containing a subnet address in CIDR (Classless Inter-Domain Routing) format from a binary or alphanumeric IPv6 address. [IP address functions]
- V6_SUBNETN
- Calculates a subnet address in CIDR (Classless Inter-Domain Routing) format from a varbinary or alphanumeric IPv6 address. [IP address functions]
- V6_TYPE
- Returns an INTEGER value that classifies the type of the network address passed to it as defined in IETF RFC 4291 section 2.4. [IP address functions]
- VALIDATE_STATISTICS
- Validates statistics in the XML file generated by EXPORT_STATISTICS. [Statistics management functions]
- VAR_POP [aggregate]
- Evaluates the population variance for each member of the group. [Aggregate functions]
- VAR_POP [analytic]
- Returns the statistical population variance of a non-null set of numbers (nulls are ignored) in a group within a. [Analytic functions]
- VAR_SAMP [aggregate]
- Evaluates the sample variance for each row of the group. [Aggregate functions]
- VAR_SAMP [analytic]
- Returns the sample variance of a non-NULL set of numbers (NULL values in the set are ignored) for each row of the group within a. [Analytic functions]
- VARIANCE [aggregate]
- Evaluates the sample variance for each row of the group. [Aggregate functions]
- VARIANCE [analytic]
- Returns the sample variance of a non-NULL set of numbers (NULL values in the set are ignored) for each row of the group within a. [Analytic functions]
- VERIFY_HADOOP_CONF_DIR
- Verifies that the Hadoop configuration that is used to access HDFS is valid on all Vertica nodes. [Hadoop functions]
- VERSION
- Returns a VARCHAR containing a Vertica node's version information. [System information functions]

### W

- WEEK
- Returns the week of the year for the specified date as an integer, where the first week begins on the first Sunday on or preceding January 1. [Date/time functions]
- WEEK_ISO
- Returns the week of the year for the specified date as an integer, where the first week starts on Monday and contains January 4. [Date/time functions]
- WIDTH_BUCKET
- Constructs equiwidth histograms, in which the histogram range is divided into intervals (buckets) of identical sizes. [Mathematical functions]
- WITHIN GROUP ORDER BY clause
- Specifies how to sort rows that are grouped by aggregate functions, one of the following:. [Aggregate functions]

### X

- XGB_CLASSIFIER
- Trains an XGBoost model for classification on an input relation. [Machine learning algorithms]
- XGB_PREDICTOR_IMPORTANCE
- Measures the importance of the predictors in an XGBoost model. [Model evaluation]
- XGB_REGRESSOR
- Trains an XGBoost model for regression on an input relation. [Machine learning algorithms]

### Y

- YEAR
- Returns an integer that represents the year portion of the specified date. [Date/time functions]
- YEAR_ISO
- Returns an integer that represents the year portion of the specified date. [Date/time functions]

### Z

- ZEROIFNULL
- Evaluates to 0 if the column is NULL. [NULL-handling functions]

#### In this section

- Aggregate functions
- Analytic functions
- Client connection functions
- Data-type-specific functions
- Database Designer functions
- Directed queries functions
- Error-handling functions
- Flex functions
- Formatting functions
- Geospatial functions
- Hadoop functions
- Machine learning functions
- Management functions
- Match and search functions
- Mathematical functions
- NULL-handling functions
- Performance analysis functions
- Stored procedure functions
- System information functions