From: Tom Lane <tgl@sss.pgh.pa.us>
To: cnliou@eurosport.com
Cc: pgsql-sql@postgresql.org
Subject: Re: Group And Sort After Union
Date: Fri, 02 Aug 2002 09:47:20 -0400
Message-ID: <29427.1028296040@sss.pgh.pa.us> (raw)
In-Reply-To: <eaa50a08.0207300046.fd57ade@posting.google.com>
References: <eaa50a08.0207300046.fd57ade@posting.google.com>
cnliou@eurosport.com (cnliou) writes:
> I want to GROUP BY and ORDER BY on the result of UNION similar to the
> following (wrong) SQL:
> (SELECT c11 AS c1,SUM(c12) AS c2 FROM table1
> UNION
> SELECT c21 AS c1,SUM(c22) AS c2 FROM table2
> )
> GROUP BY c1
> ORDER BY c2;
Correct is
SELECT * FROM
(SELECT c11 AS c1,SUM(c12) AS c2 FROM table1
UNION
SELECT c21 AS c1,SUM(c22) AS c2 FROM table2
) ss
GROUP BY c1
ORDER BY c2;
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, cnliou@eurosport.com
Subject: Re: Group And Sort After Union
In-Reply-To: <29427.1028296040@sss.pgh.pa.us>
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