Re: Foreign Unique Constraint

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(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org]
On Behalf Of Peter Eisentraut
Sent: Wednesday, 28 March 2007 19:08
To: pgsql-sql(at)postgresql(dot)org
Cc: Phillip Smith; 'Jon Horsman'
Subject: Re: [SQL] Foreign Unique Constraint

Am Mittwoch, 28. März 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.

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

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