From: Richard Huxton <dev@archonet.com>
To: Michael L. Hostbaek <mich@the-lab.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: select & group by
Date: Mon, 04 Apr 2005 11:39:56 +0100
Message-ID: <4251197C.1060904@archonet.com> (raw)
In-Reply-To: <20050404101647.GJ23648@mich2.itxmarket.com>
References: <20050404101647.GJ23648@mich2.itxmarket.com>
Michael L. Hostbaek wrote:
> I've got a problem selecting some specific data from my table. Imagine
> the following rows:
>
> part | mfg | qty | price | eta
> ---------------------------------------
> TEST1 ABC 10 100 (No ETA, as item is in stock)
> TEST1 ABC 12 120 04/04
> TEST2 CBA 17 10 05/05
> TEST2 CBA 10 20 (No ETA, as item is in stock)
>
>
> I'd like my selection to produce the following result:
>
> part | mfg | qty | qty incoming | highest price | eta
> -------------------------------------------------------------
> TEST1 ABC 10 12 120 04/04
> TEST2 CBA 10 17 20 05/05
>
> Any clues on how to do this ? I kow the group by part, mfg, max(price) -
> but I do not know how to deal with the splitting up qty and stock qty
> and incoming qty.
How about something like:
SELECT
aa.part,
aa.mfg,
aa.qty,
bb.qty AS qty_incoming,
CASE WHEN aa.price > bb.price THEN aa.price ELSE bb.price END AS
highest_price,
aa.eta
FROM
(
SELECT part,mfg,qty,price FROM mytable WHERE eta IS NOT NULL
) aa,
(
SELECT part,mfg,qty,price FROM mytable WHERE eta IS NULL
) bb
WHERE
aa.part = bb.part
AND aa.mfg=bb.mfg
;
This is assuming you only have one row with "eta" set for each
(part,mfg). If not, you'll have to identify which row you want.
--
Richard Huxton
Archonet Ltd
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To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, mich@the-lab.org
Subject: Re: select & group by
In-Reply-To: <4251197C.1060904@archonet.com>
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