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Check constraints are like COND however there is a difference. Check
constraints are actually enforced. COND is often ignored. I do not think
that UPDDTA enforced COND from day 1 but it does now. You could create an
RPG program which update a COND field with invalid values. You could even
use CPYF of a one field file of all X to a file with multiple fields with
a COND with not X and it will allow it. The constraint won't.
Rob Berendt
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