SUBSTRB

Returns an octet value representing the substring of a specified string.

Behavior type

Syntax

SUBSTRB ( string , position [ , extent ] )

Arguments

string

(CHAR/VARCHAR) is the string from which to extract a substring.

position

(INTEGER or DOUBLE PRECISION) is the starting position of the substring (counting from one in octets).

extent

(INTEGER or DOUBLE PRECISION) is the length of the substring to extract (in octets). The default is the end of the string

Notes

• This function treats the multibyte character string as a string of octets (bytes) and uses octet numbers as incoming and outgoing position specifiers and lengths. The strings themselves are type VARCHAR, but they treated as if each octet were a separate character.

• SUBSTRB truncates DOUBLE PRECISION input values.

Examples

=> SELECT SUBSTRB('soupçon', 5);
 SUBSTRB
---------
 çon
(1 row)

=> SELECT SUBSTRB('soupçon', 5, 2);
 SUBSTRB
---------
 ç
(1 row)

Vertica returns the following error message if you use BINARY/VARBINARY:

=>SELECT SUBSTRB('abc'::binary(3),1);
ERROR: function substrb(binary, int) does not exist, or permission is denied for substrb(binary, int)
HINT: No function matches the given name and argument types. You may need to add explicit type casts.