COMMENT ON CONSTRAINT

Adds, revises, or removes a comment on a constraint.

Adds, revises, or removes a comment on a constraint. Each object can have one comment. Comments are stored in the system table COMMENTS.

Syntax

COMMENT ON CONSTRAINT constraint ON [[database.]schema.]table IS ... {'comment' | NULL };

constraint: The name of the constraint associated with the comment.
[database.]schema: Database and schema. The default schema is public. If you specify a database, it must be the current database.
table: The name of the table constraint with which to associate a comment.
comment: Specifies the comment text to add. If a comment already exists for this constraint, this comment overwrites the previous one.
Comments can be up to 8192 characters in length. If a comment exceeds that limitation, Vertica truncates the comment and emits a message.
NULL: Removes an existing comment.

Non-superuser: object owner

The following example adds a comment to the constraint_x constraint on the promotion_dimension table:

=> COMMENT ON CONSTRAINT constraint_x ON promotion_dimension IS 'Primary key';

The following example removes a comment from the constraint_x constraint on the promotion_dimension table:

=> COMMENT ON CONSTRAINT constraint_x ON promotion_dimension IS NULL;