Re: sub-selects in CHECK

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: nconway(at)klamath(dot)dyndns(dot)org (Neil Conway)
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: sub-selects in CHECK
Date: 2002-07-27 23:07:13
Message-ID: 7684.1027811233@sss.pgh.pa.us
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nconway(at)klamath(dot)dyndns(dot)org (Neil Conway) writes:
> I'd like to add the ability to use a sub-select in a CHECK constraint.
> Can someone elaborate on what changes would be needed to support
> this?

Define what you think should happen when the other rows referenced
by the subselect change.

regards, tom lane

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