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 3B1AED6FBB for ; Tue, 23 Aug 2005 05:33:21 -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 24153-01 for ; Tue, 23 Aug 2005 08:33:16 +0000 (GMT) Received: from stan.ringways.co.uk (hub.ringways.co.uk [213.38.87.130]) by svr1.postgresql.org (Postfix) with ESMTP id E6452D6F9A for ; Tue, 23 Aug 2005 05:33:14 -0300 (ADT) Received: from gary.ringways.co.uk ([10.1.1.2]) by stan.ringways.co.uk with esmtp (Exim 3.22 #1) id 1E7UFN-0001l1-00 for pgsql-sql@postgresql.org; Tue, 23 Aug 2005 09:35:05 +0100 Content-Type: text/plain; charset="us-ascii" From: Gary Stainburn Organization: Ringways Garages Ltd To: pgsql-sql@postgresql.org Subject: diary constraints Date: Tue, 23 Aug 2005 09:33:58 +0100 User-Agent: KMail/1.4.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: <200508230933.59043.gary.stainburn@ringways.co.uk> X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0 required=5 tests=[none] X-Spam-Level: X-Archive-Number: 200508/197 X-Sequence-Number: 22425 Hi folks I know this has been discussed in the past, but no amount of keywords has returned anything from the archives. I want to create a courtesy car diary diary system where I have a table containing all of the cortesy cars in the pool, and then an allocation table which has two timestamps, one for the start date/time and one for the return date/time. How do I go about creating constraints on inserts and updates to ensure that a) the finish is after the start b) two allocations for a single vehicle don't overlap. -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000