mysql 5.7.15 union order by 子查询排序不生效

其实这么写理论上是对的,不少博客教程都是这样子写的。。 select * from (SELECT * FROM article WHERE is_top=0 ORDER BY id DESC) as t1 union select * from (SELECT * FROM article WHERE is_top=1 ORDER BY start_time desc) as t2 而后仍是发现
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