※ 引述《alexcwtzeng (狂瀉不止)》之銘言：
: group by 不能跟 order by 一起使用哦
應該是可以一起用....
derived table 要有各名字...
$sql="SELECT number,SUM(count) FROM
(SELECT * FROM Table1 UNION ALL SELECT * FROM Table2 UNION ALL
SELECT * FROM Table3) a
group by number order by SUM(count) desc";
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