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To: Robert Creager <Robert_Creager@LogicalChaos.org>
Cc: PGSQL <pgsql-sql@postgresql.org>
Subject: Re: How can I get the last element out of GROUP BY sets? 
In-reply-to: <20040118212834.7c667b9b.Robert_Creager@LogicalChaos.org> 
References: <20040118212834.7c667b9b.Robert_Creager@LogicalChaos.org>
Comments: In-reply-to Robert Creager <Robert_Creager@LogicalChaos.org>
	message dated "Sun, 18 Jan 2004 21:28:34 -0700"
Date: Mon, 19 Jan 2004 00:44:30 -0500
Message-ID: <20989.1074491070@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Robert Creager <Robert_Creager@LogicalChaos.org> writes:
> ... one piece of data I need is the last value for each GROUP BY
> period.  Alas, I cannot figure out how to do this.

SELECT DISTINCT ON (rather than GROUP BY) could get this done for you.

			regards, tom lane