Re: Another weird one with an UPDATE - Mailing list pgsql-performance

Thanks - that worked.

David
----- Original Message -----
From: "Stephan Szabo" <sszabo@megazone.bigpanda.com>
To: "David Griffiths" <dgriffiths@boats.com>
Cc: <pgsql-performance@postgresql.org>
Sent: Saturday, October 11, 2003 3:34 PM
Subject: Re: [PERFORM] Another weird one with an UPDATE


> On Sat, 11 Oct 2003, David Griffiths wrote:
>
> > Sorry - just found the FAQ (
> > http://jamesthornton.com/postgres/FAQ/faq-english.html#4.22
> > <http://jamesthornton.com/postgres/FAQ/faq-english.html#4.22> ) on how
> > IN is very slow.
> >
> > So I rewrote the query:
> >
> > \o ./data/temp.txt
> > SELECT current_timestamp;
> > UPDATE user_account SET last_name = 'abc'
> > WHERE EXISTS (SELECT ua.user_account_id FROM user_account ua,
> > commercial_entity ce, commercial_service cs
> > WHERE ua.user_account_id = ce.user_account_id AND
> > ce.commercial_entity_id = cs.commercial_entity_id);
> > SELECT current_timestamp;
>
> I don't think that's the query you want.  You're not binding the subselect
> to the outer values of user_account.
>
> I think you want something like:
> UPDATE user_account SET last_name = 'abc'
>  WHERE EXISTS (SELECT 1 FROM commercial_entity ce, commercial_service cs
>  WHERE user_account.user_account_id = ce.user_account_id AND
>  ce.commercial_entity_id = cs.commercial_entity_id);