Difference between revisions of "DESCRIPTION Column Constraint"
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==Purpose== | ==Purpose== | ||
Column constraint to set the column description for the specified column | Column constraint to set the column description for the specified column | ||
Revision as of 15:03, 29 October 2009
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
set sql to recital exec sql ALTER TABLE customer ADD COLUMN dateref date DEFAULT date() DESCRIPTION "Date Reference"; use customer list structure
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
