select a.uid,a.uname,bb.addate
from a
left join(select uid,max(addate) addate from (select * from b union select * from c)aa group by aa.uid)bb
where a.uid=bb.uid
from a
left join(select uid,max(addate) addate from (select * from b union select * from c)aa group by aa.uid)bb
where a.uid=bb.uid
解决方案 »
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