Received: from localhost.localdomain (postgresql.org [64.49.215.8]) by localhost (Postfix) with ESMTP id E2DCA476ABC for ; Tue, 18 Jun 2002 20:43:30 -0400 (EDT) Received: from mta4.snet.net (mta4.snet.net [204.60.203.76]) by postgresql.org (Postfix) with ESMTP id A4F52476713 for ; Tue, 18 Jun 2002 19:49:50 -0400 (EDT) Received: from pop.snet.net ([204.60.203.73]) by mta4.snet.net (8.12.3/8.12.3/SNET-mx-1.2/D-1.1.1.1/O-1.1.1.1) with ESMTP id g5INniHH003625; Tue, 18 Jun 2002 19:49:44 -0400 (EDT) X-Originating-IP: [64.252.95.167] X-SBCIS-MTA: [pop.snet.net] Received: from [192.168.1.83] (167.95.252.64.snet.net [64.252.95.167]) by pop.snet.net (8.12.3/8.12.3/SNET-pop-1.2/D-1.1.1.1/O-1.1.1.1) with ESMTP id g5INnnkY023277; Tue, 18 Jun 2002 19:49:49 -0400 (EDT) Subject: Re: text vs varchar From: Wei Weng To: josh@agliodbs.com Cc: pgsql-sql@postgresql.org In-Reply-To: <200206181559.54654.josh@agliodbs.com> References: <1024438061.16895.2.camel@Monet> <200206181559.54654.josh@agliodbs.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.5 (1.0.5-4) Date: 18 Jun 2002 19:49:50 -0400 Message-Id: <1024444191.16918.6.camel@Monet> Mime-Version: 1.0 X-Archive-Number: 200206/235 X-Sequence-Number: 8200 On Tue, 2002-06-18 at 18:59, Josh Berkus wrote: > Wei, > > > Is there any disadvantage of using TEXT datatype as opposed to a VARCHAR > > datatype with a maximum length, especially when I do searches on them? > > Yes. You can't index TEXT because it's of potentially unlimited length. > > -- > -Josh Berkus > > I noticed that it is a characteristics of MS SQL Server, but I did successfully create unique index based on a TEXT field in Postgresql 7.2, while that failed in MS SQL Server (7). Or do they behave the same in this aspect? Thanks -- Wei Weng Network Software Engineer KenCast Inc.