帮忙，求一SQL语句。该如何处理_ASP.NET

帮忙，求一SQL语句。。
SQL语句，如何设计？

select DW,DADUI,PERSON,...... from ...

其中如果DW与DADUI均相同，则取一条。

------解决方案--------------------------------------------------------

探讨

还可以：
SQL code

select DW,DADUI,min(PERSON) as PERSON from DataTable
group by DW,DADUI

------解决方案--------------------------------------------------------

SQL code

declare @T table (DW int,DADUI int,PERSON varchar(1))insert into @Tselect 1,1,'a' union allselect 1,1,'b' union allselect 1,2,'c' union allselect 1,3,'d' union allselect 1,4,'e' union allselect 1,4,'f'select * from @T/*DW          DADUI       PERSON----------- ----------- ------1           1           a1           1           b1           2           c1           3           d1           4           e1           4           f*/select * from @T twhere PERSON=(select max(PERSON) from @T WHERE DW=T.DW AND DADUI=T.DADUI) ORDER  BY DW,DADUI/*DW          DADUI       PERSON----------- ----------- ------1           1           b1           2           c1           3           d1           4           f*/
------解决方案--------------------------------------------------------
探讨

还可以：
SQL code

select DW,DADUI,min(PERSON) as PERSON from DataTable
group by DW,DADUI

------解决方案--------------------------------------------------------
探讨

还可以：
SQL code

select DW,DADUI,min(PERSON) as PERSON from DataTable
group by DW,DADUI