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> Also, as several other people already pointed out, a constraint
> involving a select could be violated in many ways including alteration
> or removal of tuples in other tables. We only evaluate check
> constraints when we insert/update tuples in the table they are attached
> to...
OK.
Is this something that could be accomplished with triggers? :o
Also, is it possible to have a foreign key constraint across multiple
columns? :o
Ian
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