From: Michael Fuhr <mike@fuhr.org>
To: Jeffrey Melloy <jmelloy@visualdistortion.org>
Cc: Weimao Ke <wke@indiana.edu>
Cc: pgsql-sql@postgresql.org
Subject: Re: pgsql aggregate: conditional max
Date: Sat, 11 Mar 2006 22:48:54 -0700
Message-ID: <20060312054854.GA25553@winnie.fuhr.org> (raw)
In-Reply-To: <4413B301.7070207@visualdistortion.org>
References: <4413AD1C.9050604@indiana.edu>
<4413B301.7070207@visualdistortion.org>
On Sun, Mar 12, 2006 at 12:34:57AM -0500, Jeffrey Melloy wrote:
> Should be able to do this with a standard max() aggregate.
>
> select aid, cat, max(weight)
> from table
> group by aid, cat;
That query returns the maximum weight for each (aid, cat) pair.
Against the example data it returns the entire table, not the
(aid, cat) pair with the max weight for a given aid.
--
Michael Fuhr
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To: pgsql-sql@postgresql.org
Cc: mike@fuhr.org, jmelloy@visualdistortion.org, wke@indiana.edu
Subject: Re: pgsql aggregate: conditional max
In-Reply-To: <20060312054854.GA25553@winnie.fuhr.org>
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