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这是记录表中的某一个ID的多条记录，我想取得最后一次修改时间的状态，用SQL怎么写出来啊？
求指导！
4 个解决方案
#1
select * from tablename as a
where max(logdate)
(select max(logdate) from tablename as b where a.id=b.id)
where max(logdate)
(select max(logdate) from tablename as b where a.id=b.id)
#2
少个=号 呵呵
#3
select ID, OrderState, LogDate from (
select * ,row_number() over(partition by ID order by LogDate desc) as rID from tablename
) a where rID=1
select * ,row_number() over(partition by ID order by LogDate desc) as rID from tablename
) a where rID=1
#4
其实这个子查询效率比ROW_nUMBER效率高
#1
select * from tablename as a
where max(logdate)
(select max(logdate) from tablename as b where a.id=b.id)
where max(logdate)
(select max(logdate) from tablename as b where a.id=b.id)
#2
少个=号 呵呵
#3
select ID, OrderState, LogDate from (
select * ,row_number() over(partition by ID order by LogDate desc) as rID from tablename
) a where rID=1
select * ,row_number() over(partition by ID order by LogDate desc) as rID from tablename
) a where rID=1
#4
其实这个子查询效率比ROW_nUMBER效率高