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=ERROR= ==Class== Column Constraints ==Purpose== Column constraint to define an error message to be displayed when a validation check fails ==Syntax== ERROR <expC> ==See Also== [[ALTER TABLE]], [[SQL Constraints|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== <code lang="recital"> 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 </code> ==Products== Recital Database Server, Recital Mirage Server, Recital Terminal Developer [[Category:Documentation]] [[Category:SQL]]

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