这里为什么不是from users as b呢，不是要从b表中查询吗
select b.user_name,b.over,a.over from user1 as a right join user2 as b on a.user_name=b.user_name where a.user_name is not null.
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select b.user_name,b.over,a.over from user1 as a right join user2 as b on a.user_name=b.user_name where a.user_name is not null.
2017-02-28
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