ERROR Table Constraint

Purpose

Table 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. TABLE constraints apply to table-based operations. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.

The ERROR table 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

CREATE TABLE purchase_order;
  (POid i PRIMARY KEY, SuppId i, POtotal n(10,2),;
  CHECK callauth();
  ERROR [Not authorized])

Products

Lianja, Lianja Server