X-Original-To: pgsql-sql@postgresql.org
Received: from fzkmail2.fzk.de (fzkmail2.fzk.de [141.52.27.52])
	by postgresql.org (Postfix) with SMTP id 439B2476262
	for <pgsql-sql@postgresql.org>; Wed,  5 Mar 2003 09:27:37 -0500 (EST)
Received: FROM resy5.fzk.de BY fzkmail2.fzk.de ;
 Wed Mar 05 15:27:40 2003 +0100
Received: œby rodos.fzk.de with ESMTP (8.8.6 (PHNE_17135)/8.7.1) id PAA19733; Wed, 5 Mar 2003 15:27:40 +0100 (MET)
Message-ID: <3E66095B.247A3D1B@rodos.fzk.de>
Date: Wed, 05 Mar 2003 15:27:39 +0100
From: Christoph Haller <ch@rodos.fzk.de>
X-Mailer: Mozilla 4.77 [en] (X11; U; HP-UX B.10.20 9000/780)
X-Accept-Language: en
MIME-Version: 1.0
To: pgsql-sql@postgresql.org
Cc: luca.scaramella@recom.it
Subject: Re: DELETE FROM A BLACK LIST
Content-Type: text/plain; charset=iso-8859-2
Content-Transfer-Encoding: 7bit
X-Archive-Number: 200303/154
X-Sequence-Number: 12194

>
> I have a Blacklist table containing about 1000 ID to delete from
another
> table (T1 about 1440294 records)
> If i use the SQL
>
> DELETE FROM T1 WHERE T1.ID IN (SELECT BLACKLIST.ID FROM BLACKLIST)
>
> the operation is very slow .
>
> There is a faster way to do the same operation??
>
Try
DELETE FROM T1 WHERE T1.ID = BLACKLIST.ID
It really works.

Regards, Christoph