RECALCULATE Column Constraint

From Recital Documentation Wiki
Revision as of 14:58, 29 October 2009 by Helengeorge (Talk | contribs)

Jump to: navigation, search

Purpose

Column constraint to force recalculation of calculated columns when a column's value changes


Syntax

RECALCULATE


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 RECALCULATE column constraint is used to force recalculation of calculated columns when a column's value changes. Any column which forms part of the calculation expression of a CALCULATED column must have the RECALCULATE column constraint set.


Example

ALTER TABLE customer
ALTER COLUMN available CALCULATED limit-balance
ALTER COLUMN limit RECALCULATE
ALTER COLUMN balance RECALCULATE;


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer