X-Original-To: pgsql-docs-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id F305332A27E for ; Wed, 29 Sep 2004 14:26:21 +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 33684-07 for ; Wed, 29 Sep 2004 13:26:06 +0000 (GMT) Received: from mail63.csoft.net (leary3.csoft.net [63.111.22.74]) by svr1.postgresql.org (Postfix) with SMTP id A2BB832A183 for ; Wed, 29 Sep 2004 14:26:00 +0100 (BST) Received: (qmail 13926 invoked by uid 1112); 29 Sep 2004 13:25:59 -0000 Date: Wed, 29 Sep 2004 08:25:59 -0500 (EST) From: Kris Jurka X-X-Sender: books@leary.csoft.net To: "Thomas F.O'Connell" Cc: Stephan Szabo , pgsql-docs@postgresql.org Subject: Re: EXTRACT Clarification In-Reply-To: <0E177963-1214-11D9-8537-000D93AE0944@sitening.com> Message-ID: References: <20040928222637.L43334@megazone.bigpanda.com> <0E177963-1214-11D9-8537-000D93AE0944@sitening.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.0 tagged_above=0.0 required=5.0 tests= X-Spam-Level: X-Archive-Number: 200409/39 X-Sequence-Number: 2558 On Wed, 29 Sep 2004, Thomas F.O'Connell wrote: > Note: EXTRACT is not a true function. SQL defines it as an expression > that happens to look similar to a function call. > > Also, are there other expressions that fall into this category? I don't > know the spec well enough to know. At least COALESCE and NULLIF are not functions. Kris Jurka