Received: from localhost (postgresql.org [64.49.215.8]) by postgresql.org (Postfix) with ESMTP id 335A347546E for ; Sat, 17 Aug 2002 07:21:24 -0400 (EDT) Received: from candle.pha.pa.us (216-55-132-35.dsl.san-diego.abac.net [216.55.132.35]) by postgresql.org (Postfix) with ESMTP id 32568475469 for ; Sat, 17 Aug 2002 07:21:23 -0400 (EDT) Received: (from pgman@localhost) by candle.pha.pa.us (8.11.6/8.10.1) id g7HBLKL18248; Sat, 17 Aug 2002 07:21:20 -0400 (EDT) From: Bruce Momjian Message-Id: <200208171121.g7HBLKL18248@candle.pha.pa.us> Subject: Re: Difference between is true and = 't' in boolean feild. & bitmap In-Reply-To: <200208171102.58808.mallah@trade-india.com> To: "Rajesh Kumar Mallah." Date: Sat, 17 Aug 2002 07:21:20 -0400 (EDT) Cc: pgsql-sql@postgresql.org X-Mailer: ELM [version 2.4ME+ PL99 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII X-Virus-Scanned: by AMaViS new-20020517 X-Archive-Number: 200208/254 X-Sequence-Number: 9100 Rajesh Kumar Mallah. wrote: > > > Any can anyone explain me why in a query of a boolean feild > "is ture" does not indexes where as = 't' does? is "is true" > not a more standard SQL than " = 't' ". Not sure. > Also is there any working implementation of BITMAP INDEXES in > postgresql as found in ORACLE? We have discussed them and see a few uses for them. See the TODO list under Performance and there is a link to some emails discussing it. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073