Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id CC3AF2E42B4 for ; Mon, 7 Jan 2008 18:39:16 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 31431-01-7 for ; Mon, 7 Jan 2008 18:39:13 -0400 (AST) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.179]) by postgresql.org (Postfix) with ESMTP id 126102E4291 for ; Mon, 7 Jan 2008 18:37:53 -0400 (AST) Received: by wa-out-1112.google.com with SMTP id m38so13169834waf.5 for ; Mon, 07 Jan 2008 14:37:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=FkLJbuJkKzuzuw2ewdN1JYF1gkrnDATmbcyL7pgbeOA=; b=HAghRJZ8CwhgrC/zAqjQr6+BXtBAXTKjbweRssnr6cBNWVi0ODfoR2VzerLrtv+fFgJJeieBOvjO6+r3bzCohoIZ9DW9dNHMja1jlVpOPjhu3W9imQlSaqvtRCS10q1WWErhY6UA5jlnkLhfDvZpnaxYzcf2y4pnED7XtJeNHq0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=XeqI+awWkiIw6FhSa1wr8z1Ex7+6sAxz9Uxs1d+n6PvUU0YmVaemGFntaLmNBa8zRyOfh4LewdeSKvnc8cQF1q5zXbcrbOSgyrK+zPBJZsiV7b+2b5dytMi5O9okwxH3dKxfR8mGQLb7LhOoHV8E6A5jX+Kwqc4Q4ZQ6ExBkWVg= Received: by 10.114.209.1 with SMTP id h1mr22526396wag.130.1199745472107; Mon, 07 Jan 2008 14:37:52 -0800 (PST) Received: by 10.114.131.4 with HTTP; Mon, 7 Jan 2008 14:37:52 -0800 (PST) Message-ID: Date: Mon, 7 Jan 2008 16:37:52 -0600 From: "Scott Marlowe" To: "Richard Broersma Jr" Subject: Re: Get the max(value1, value2, value3) from a table Cc: emilu@encs.concordia.ca, pgsql-sql@postgresql.org In-Reply-To: <239138.99803.qm@web31804.mail.mud.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <239138.99803.qm@web31804.mail.mud.yahoo.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200801/36 X-Sequence-Number: 29889 On Jan 7, 2008 4:27 PM, Richard Broersma Jr wrote: > --- On Mon, 1/7/08, Scott Marlowe wrote: > > > select max(col1) from table > > union all > > select max(col2) from table > > union all > > select max(col3) from table > > Would the following work also? > > SELECT MAX( GREATEST( col1, col2, col3 ) ) > FROM TABLE; Not given his example output. Given that output, he wants the max of each column, and your example would only return a single value.