Re: Group And Sort After Union

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