X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id A0C13DA8E0 for ; Wed, 26 Oct 2005 13:39:14 -0300 (ADT) 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 90238-03 for ; Wed, 26 Oct 2005 16:39:12 +0000 (GMT) Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by svr1.postgresql.org (Postfix) with ESMTP id B62CED6D96 for ; Wed, 26 Oct 2005 13:39:12 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.1/8.13.1) with ESMTP id j9QGdCSd007221; Wed, 26 Oct 2005 12:39:12 -0400 (EDT) To: chester c young Cc: pgsql-sql@postgresql.org Subject: Re: broken join optimization? (8.0) In-reply-to: <20051026161257.3430.qmail@web54305.mail.yahoo.com> References: <20051026161257.3430.qmail@web54305.mail.yahoo.com> Comments: In-reply-to chester c young message dated "Wed, 26 Oct 2005 09:12:57 -0700" Date: Wed, 26 Oct 2005 12:39:12 -0400 Message-ID: <7220.1130344752@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.006 required=5 tests=[AWL=0.006] X-Spam-Level: X-Archive-Number: 200510/339 X-Sequence-Number: 23192 chester c young writes: > i think i misled: the goal is to retrieve _one_ row where the value of > each attribute is null. Er, what for? There's no data content in that, by definition. Why not retrieve zero rows and look at the metadata anyway? regards, tom lane