On Sun, Mar 05, 2006 at 12:02:58PM +0300, Nikolay Samokhvalov wrote:
> Unfortunately, at the moment Postgres doesn't support subqueries in
> CHECK constraints, so it's seems that you should use trigger to check
> what you need
The OP could also use a check constraint with a function if
everything (the context) but the value to check is known
beforehand or can be derived from it.
Karsten
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