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select id, addr, riqi, row_number()over (partition by riqi order by riqi) as paixu
from
(select 1 id,‘AA‘ addr,20150101 as riqi from dual
union all
select 1 id,‘BB‘ addr,20150201 as riqi from dual) where rownum =1 ;
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原文地址：http://www.cnblogs.com/zhangwensi/p/4746434.html
