DESCRIPTION Column Constraint

Purpose

Column constraint to set the column description for the specified column

Syntax

DESCRIPTION <expC>

See Also

ALTER TABLE, CONSTRAINTS, CREATE TABLE

Description

A constraint is used to define rules that help to provide data integrity. Column constraints are specific to the column name specified. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.

The DESCRIPTION column constraint is used to set the column description for the specified column. The <expC> is a character expression of up to 25 characters.

Example

ALTER TABLE customer;
  ADD COLUMN dateref DATE;
  DEFAULT date();
  DESCRIPTION "Date Reference"

Products

Recital, Recital Server