Date: Thu, 4 Nov 2004 17:25:08 +0000
From: Sam Mason <mason@f2s.com>
To: pgsql-sql@postgresql.org
Subject: Re: Group by and aggregates
Message-ID: <20041104172507.GG25775@sam.samason.me.uk>
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References: <20041104165430.GD94770@mich2.itxmarket.com>
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Michael L. Hostbaek wrote:
>Now, I need the first line to say "15.00" in the cmup field. That is,
>stock and incoming are obviously not being grouped, but since it's the
>same partno I'd like somehow to show the highest cmup. Is there some
>black SQL voodoo that'll achieve this ?

I think you need to join the table back on itself to get the total
for each part.  Not a very impressive incantation, but I'd do it 
in SQL like this:

  SELECT x.partno, x.status, y.tot, sum(x.qty)
  FROM my_table x, (
    SELECT partno, MAX(cmup) as tot
    FROM my_table
    GROUP BY partno) y
  WHERE x.partno = y.partno
  GROUP BY x.partno, x.status, y.tot

Cheers,
  Sam