X-Original-To: pgsql-hackers-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id B71AE9DC84E; Wed, 8 Mar 2006 11:54:35 -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 25610-10; Wed, 8 Mar 2006 11:54:40 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 76DEB9DC826; Wed, 8 Mar 2006 11:54:33 -0400 (AST) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.1/8.13.1) with ESMTP id k28FsISZ014845; Wed, 8 Mar 2006 10:54:19 -0500 (EST) To: Scott Marlowe cc: Markus Schaber , Bruce Momjian , Stephan Szabo , "Milen A. Radev" , pgsql-sql@postgresql.org, pgsql-hackers@postgresql.org Subject: Re: [SQL] Interval subtracting In-reply-to: <1141832866.6249.7.camel@state.g2switchworks.com> References: <200603012027.k21KRk423759@candle.pha.pa.us> <1141245396.18820.16.camel@state.g2switchworks.com> <440EC8FF.9080201@logix-tt.com> <1141832866.6249.7.camel@state.g2switchworks.com> Comments: In-reply-to Scott Marlowe message dated "Wed, 08 Mar 2006 09:47:47 -0600" Date: Wed, 08 Mar 2006 10:54:18 -0500 Message-ID: <14844.1141833258@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.112 required=5 tests=[AWL=0.112] X-Spam-Score: 0.112 X-Spam-Level: X-Archive-Number: 200603/455 X-Sequence-Number: 80853 Scott Marlowe writes: > For same reasons, i.e. a need for precision, I find it hard to accept > the idea of mixing positive and negative units in the same interval. The semantics are perfectly well defined, so I don't buy this. regards, tom lane