Sorry for the bad info, I got the idea from an article in microsoft's dialect of sql.
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How to use SQL Constraint logic
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A bit late now, but an article on handling constraint violations in RPG just dropped on ITJungle:
Author’s Note: The contents of this article were originally published as two separate articles – Handling Constraint Violations in RPG and Handling Constraints Revisited. The content of the article has been updated for free form RPG and some of the coding enhancements that have been introduced, into RPG, since 2009. Constraints have been around for
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