X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 90EBA9DC867 for ; Wed, 1 Mar 2006 07:33:05 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 60023-04 for ; Wed, 1 Mar 2006 07:33:06 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.187]) by postgresql.org (Postfix) with ESMTP id 3C01E9DC840 for ; Wed, 1 Mar 2006 07:33:00 -0400 (AST) Received: from [194.25.154.138] (helo=webserv.wug.de) by mrelayeu.kundenserver.de (node=mrelayeu9) with ESMTP (Nemesis), id 0ML2xA-1FEPZm2S4M-0003Eq; Wed, 01 Mar 2006 12:33:03 +0100 Received: from kretschmer by webserv.wug.de with local (Exim 3.36 #1) id 1FEPZl-0004Pw-00 for pgsql-sql@postgresql.org; Wed, 01 Mar 2006 12:33:01 +0100 Date: Wed, 1 Mar 2006 12:33:01 +0100 From: "A. Kretschmer" To: pgsql-sql@postgresql.org Subject: Re: Index to support LIKE '%suffix' queries Message-ID: <20060301113301.GD9939@webserv.wug-glas.de> Mail-Followup-To: "A. Kretschmer" , pgsql-sql@postgresql.org References: <87mzgfh69m.fsf@mid.deneb.enyo.de> <11673.1140888147@sss.pgh.pa.us> <877j7jfhqs.fsf@mid.deneb.enyo.de> <20060225181346.GA6092@surnet.cl> <874q2ik4xf.fsf@mid.deneb.enyo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <874q2ik4xf.fsf@mid.deneb.enyo.de> X-DEST: 208 X-OS: Linux - weil ich es mir Wert bin! X-Info: registrierter Linux-User 97922 http://counter.li.org User-Agent: mutt-ng 1.5.9i (Linux) X-Provags-ID: kundenserver.de abuse@kundenserver.de login:51ea9561fc3f6d9539a2acd743e4748c X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.474 required=5 tests=[AWL=0.474] X-Spam-Score: 0.474 X-Spam-Level: X-Archive-Number: 200603/5 X-Sequence-Number: 24351 am 01.03.2006, um 8:19:40 +0100 mailte Florian Weimer folgendes: > * Alvaro Herrera: > > >> > Florian Weimer writes: > >> >> Is it possible to create an index to support queries of the form > >> >> "column LIKE '%suffix'" (similar to an ordinary index for LIKE > >> >> 'prefix%', which I also need)? > > > > It is possible to create a functional index on the reverse of the > > string. > > Okay. Is there a predefined reverse function? I couldn't find one > and I'm wondering if I just missed it. simple to write one, http://a-kretschmer.de/diverses.shtml HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe ===