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关于表连接如(union join)中使用order limit
Eg: select 1 order by 1 union select 2 order by 1
正确使用方法
(select 1 order by 1 limit 1) union (select 2 order by 2) order by 1
对各个结果集排序
Incorrect usage of UNION and ORDER BY
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原文地址:http://www.cnblogs.com/hackforfun/p/4183350.html