Received: from localhost (unknown [200.46.204.184]) by postgresql.org (Postfix) with ESMTP id 62D1A2E0326 for ; Wed, 12 Mar 2008 13:02:04 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 51204-01 for ; Wed, 12 Mar 2008 13:01:37 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from perseverance.services.encs.concordia.ca (perseverance-96.encs.concordia.ca [132.205.96.94]) by postgresql.org (Postfix) with ESMTP id 31E7F2E3280 for ; Wed, 12 Mar 2008 13:01:24 -0300 (ADT) Received: from cacao.encs.concordia.ca (emilu@cacao.encs.concordia.ca [132.205.47.225]) by perseverance.services.encs.concordia.ca (envelope-from emilu@encs.concordia.ca) (8.13.7/8.13.7) with ESMTP id m2CG1LWu004826; Wed, 12 Mar 2008 12:01:22 -0400 Message-ID: <47D7FE51.60004@encs.concordia.ca> Date: Wed, 12 Mar 2008 12:01:21 -0400 From: Emi Lu Reply-To: emilu@encs.concordia.ca User-Agent: Thunderbird 2.0.0.12 (X11/20080213) MIME-Version: 1.0 To: Aaron Bono CC: pgsql-sql@postgresql.org Subject: Re: case when... end in update clause? References: <47D7FB06.10707@encs.concordia.ca> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.58 on perseverance.encs.concordia.ca at 2008/03/12 12:01:22 EDT X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200803/56 X-Sequence-Number: 30384 Aaron Bono wrote: > On Wed, Mar 12, 2008 at 10:47 AM, Emi Lu wrote: > >> Hello, >> >> May I know can "case when " used by update clause. If yes, how? >> >> I use one small Example, table: test >> ============================= >> id >> == >> 5 >> 6 >> 8 >> >> try to update test.id >> >> >> update test >> >> case >> when id =5 then SET id = 6 >> end >> ; >> >> >> > > Is this what you are looking for: > > > update test > set id = case when id = 5 then 6 else id end; > Exactly what I am looking for! Thanks a lot!