X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 339DE9FB284 for ; Wed, 9 Aug 2006 12:09:23 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 95287-01 for ; Wed, 9 Aug 2006 12:09:05 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id BCB2C9FB1FE for ; Wed, 9 Aug 2006 12:09:04 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.6/8.13.6) with ESMTP id k79F8xm8020368; Wed, 9 Aug 2006 11:08:59 -0400 (EDT) To: Michal Taborsky - Internet Mall cc: pgsql-performance@postgresql.org Subject: Re: 3-table query optimization In-reply-to: <44D9EBEB.9010704@mall.cz> References: <44D9EBEB.9010704@mall.cz> Comments: In-reply-to Michal Taborsky - Internet Mall message dated "Wed, 09 Aug 2006 16:06:35 +0200" Date: Wed, 09 Aug 2006 11:08:59 -0400 Message-ID: <20367.1155136139@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.136 tagged_above=0 required=5 tests=AWL, SPF_HELO_PASS, SPF_PASS X-Spam-Level: X-Archive-Number: 200608/149 X-Sequence-Number: 20334 Michal Taborsky - Internet Mall writes: > SELECT product.product_id > FROM action > JOIN product ON (product.product_id=action.product_id) > WHERE action.shop_group_id=1 > AND EXISTS (SELECT 1 > FROM catalog.product_program > WHERE product_id=product.product_id > AND product_program.program_id =1104322 > ) Try converting the EXISTS subquery to an IN. regards, tom lane