On 26 Nov 2015, at 1:36pm, Bernardo Sulzbach <mafagafogigante at gmail.com> 
wrote:

> I am not against this feature request, Simon. But enlighten my why
> this cannot be done with a CHECK constraint? I may be missing
> something very simple. Thanks.

Can you refer to another table in a CHECK constraint ?  It never occurred to me.

Simon.

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