COMMENT ON 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	Specifies a schema, by default `public`. If schema is any schema other than `public`, you must supply the schema name. For example: myschema.thisDbObject 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 alerts the user with 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;