Difference between revisions of "ERROR Column Constraint"
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==Purpose== | ==Purpose== | ||
Column constraint to define an error message to be displayed when a validation check fails | Column constraint to define an error message to be displayed when a validation check fails | ||
Revision as of 15:00, 29 October 2009
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
set sql to recital exec sql ALTER TABLE customer ADD COLUMN timeref char(8) CHECK validtime(timeref) ERROR "Not a valid time string"; use customer edit
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
