摘要: select * from table1 as a left join table2 as b on a.ID = b.IDwhere exists(select table1from (select ID ,max(DateTime) as Timefrom table1group by ID)... 阅读全文
posted @ 2015-09-14 16:42 新城已无在少年 阅读(460) 评论(0) 推荐(0) 编辑