From: Weimao Ke <wke@indiana.edu>
To: Michael Fuhr <mike@fuhr.org>
Cc: Jeffrey Melloy <jmelloy@visualdistortion.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: pgsql aggregate: conditional max
Date: Sun, 12 Mar 2006 11:55:01 -0500
Message-ID: <44145265.6030100@indiana.edu> (raw)
In-Reply-To: <20060312054854.GA25553@winnie.fuhr.org>
References: <4413AD1C.9050604@indiana.edu>
<4413B301.7070207@visualdistortion.org>
<20060312054854.GA25553@winnie.fuhr.org>
Michael Fuhr wrote:
>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 is right. This query does not solve the problem...
--
All best,
Weimao
Weimao Ke
Indiana University Bloomington
School of Library and Information Science
http://ella.slis.indiana.edu/~wke
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: wke@indiana.edu, mike@fuhr.org, jmelloy@visualdistortion.org
Subject: Re: pgsql aggregate: conditional max
In-Reply-To: <44145265.6030100@indiana.edu>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox