X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 241CE5350D for ; Tue, 29 Mar 2005 15:50:34 +0100 (BST) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 75221-02 for ; Tue, 29 Mar 2005 14:50:29 +0000 (GMT) Received: from wolff.to (wolff.to [66.93.249.74]) by svr1.postgresql.org (Postfix) with SMTP id A3038533E9 for ; Tue, 29 Mar 2005 15:50:28 +0100 (BST) Received: (qmail 32711 invoked by uid 500); 29 Mar 2005 15:07:10 -0000 Date: Tue, 29 Mar 2005 09:07:10 -0600 From: Bruno Wolff III To: T E Schmitz Cc: Alvaro Herrera , pgsql-sql@postgresql.org Subject: Re: cost of CREATE VIEW ... AS SELECT DISTINCT Message-ID: <20050329150710.GB32031@wolff.to> Mail-Followup-To: T E Schmitz , Alvaro Herrera , pgsql-sql@postgresql.org References: <42487A6D.6020506@numerixtechnology.de> <1112047463.22988.25.camel@state.g2switchworks.com> <424928D8.7060705@numerixtechnology.de> <20050329132941.GA27251@wolff.to> <4249564B.1000807@numerixtechnology.de> <20050329135823.GA23852@dcc.uchile.cl> <42496248.4080407@numerixtechnology.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <42496248.4080407@numerixtechnology.de> User-Agent: Mutt/1.5.6i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.011 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200503/380 X-Sequence-Number: 20859 On Tue, Mar 29, 2005 at 15:12:24 +0100, T E Schmitz wrote: > > Shall do. > But am I correct in assuming that I should place an index on the group > by (TRANSAKTION.ORIGIN) column? This will mainly help when joining the view to another table. This would also allow using an index scan instead of a sort in for DISTINCT which may be faster in some cases.