COMMENT ON TABLE COLUMN

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

Syntax

COMMENT ON COLUMN [[database.]schema.]table.column IS {'comment' | NULL}

`[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.column`	The name of the table and column with which to associate the comment.
comment	Specifies the comment text to add. If a comment already exists for this column, this comment overwrites the previous comment. 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.

Superuser or object owner

The following example adds a comment to the transaction_time column in the store_sales_fact table in the store schema:

=> COMMENT ON COLUMN store.store_sales_fact.transaction_time IS 'GMT';

The following example removes a comment from the transaction_time column in the store_sales_fact table in the store schema:

=> COMMENT ON COLUMN store.store_sales_fact.transaction_time IS NULL;