Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id C6E94133798E for ; Mon, 2 May 2011 19:18:50 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 17328-02 for ; Mon, 2 May 2011 22:18:43 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mail-wy0-f174.google.com (mail-wy0-f174.google.com [74.125.82.174]) by mail.postgresql.org (Postfix) with ESMTP id 1390713364DE for ; Mon, 2 May 2011 19:18:42 -0300 (ADT) Received: by wya21 with SMTP id 21so4538220wya.19 for ; Mon, 02 May 2011 15:18:42 -0700 (PDT) Received: by 10.216.177.4 with SMTP id c4mr3232667wem.3.1304374722106; Mon, 02 May 2011 15:18:42 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.167.138 with HTTP; Mon, 2 May 2011 15:18:27 -0700 (PDT) In-Reply-To: <4DB7D7E3.6010403@douglastechnology.co.uk> References: <4DB7D7E3.6010403@douglastechnology.co.uk> From: Jaime Casanova Date: Mon, 2 May 2011 17:18:27 -0500 X-Google-Sender-Auth: fS6dIgcYnBXUMZqP3n-JkcNHJrQ Message-ID: Subject: Re: boolean states To: Jack Douglas Cc: pgsql-docs@postgresql.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-5 required=5 tests=BAYES_00=-1.9 X-Spam-Level: X-Archive-Number: 201105/3 X-Sequence-Number: 6678 On Wed, Apr 27, 2011 at 3:46 AM, Jack Douglas wrote: > > This sounds like an oxymoron to me. Perhaps that sentence should be chang= ed > to: > > =C2=A0 =C2=A0 =C2=A0 =C2=A0The boolean type can have one of three states:= "true" or "false" and > "unknown". if my boolean arithmetic is not wrong the above expression is bad. better expressed is: "true", "false" or "unknown"... --=20 Jaime Casanova=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 www.2ndQuadrant.com Professional PostgreSQL: Soporte y capacitaci=C3=B3n de PostgreSQL