ERROR Column Constraint

From Recital Documentation Wiki
Revision as of 11:23, 22 December 2009 by Yvonnemilne (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Purpose

Column constraint to define an error message to be displayed when a validation check fails


Syntax

ERROR <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 ERROR column constraint is used to define an error message to be displayed when a validation check fails. The <expC> is a character string of up to 80 characters.


Example

ALTER TABLE customer;
  ADD COLUMN timeref CHAR(8);
  CHECK validtime(timeref);
  ERROR "Not a valid time string"


Products

Recital, Recital Server