日期:2014-05-17 浏览次数:20581 次
select * from tb as t where not exists(select 1 from tb where convert(varchar(13),ReadDate,120)=convert(varchar(13),ReadDate,120) and ReadNumber<t.ReadNumber )
------解决方案--------------------
select convert(decimal(18,12), replace(min(convert(char(13),readdate,120)+convert(varchar(18),ReadNumber)), min(convert(char(13),readdate,120)), '') ) from tab group by convert(char(13),readdate,120)
------解决方案--------------------
select convert(varchar(10),ReadyDate,120) 日期,datepart(hh,ReadyDate) 小时,min(ReadNumber) ReadNumber from [表] group by convert(varchar(10),ReadyDate,120),datepart(hh,ReadyDate)