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From: "Phillip Smith" <phillip.smith@weatherbeeta.com.au>
To: "'Peter Eisentraut'" <peter_e@gmx.net>,
	<pgsql-sql@postgresql.org>
Cc: "'Jon Horsman'" <horshaq@gmail.com>
Subject: Re: Foreign Unique Constraint
Date: Thu, 29 Mar 2007 08:21:31 +1000
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Is that an 8.2 thing? I'm sure I've done it before, probably in 8.1

Maybe it was a trigger I did it in - I can't remember what I had for
breakfast, let alone a slow sub-query I did months ago :P

Cheers,
~p

-----Original Message-----
From: pgsql-sql-owner@postgresql.org =
[mailto:pgsql-sql-owner@postgresql.org]
On Behalf Of Peter Eisentraut
Sent: Wednesday, 28 March 2007 19:08
To: pgsql-sql@postgresql.org
Cc: Phillip Smith; 'Jon Horsman'
Subject: Re: [SQL] Foreign Unique Constraint

Am Mittwoch, 28. M=E4rz 2007 00:17 schrieb Phillip Smith:
> Perhaps this...? It would work, but depending how many rows are in the
> table, it could become incredibly slow.
>
> ALTER TABLE table1 ADD CHECK (extension NOT IN (SELECT extension FROM
> table2));

Subqueries are not allowed in check constraints.

--=20
Peter Eisentraut
http://developer.postgresql.org/~petere/

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