sql2005 應用ROW_NUMBER() OVER(PARTITION BY 列A ORDER BY 列B )

 

 

 

 

 

--生成測試數據

create table tb1(a varchar(20) , b float) 

insert into tb1 values('001' , 1) 

insert into tb1 values('001' ,  2) 

insert into tb1 values('001' ,  3) 

insert into tb1 values('002' ,  2) 

insert into tb1 values('002' ,  5) 

insert into tb1 values('003' ,  4) 

insert into tb1 values('003' ,  5) 

insert into tb1 values('004' ,  10) 

insert into tb1 values('005' ,  12) 

insert into tb1 values('005' ,  30)

go 

 

 

SELECT a,

MAX(CASE rid WHEN 1 THEN b ELSE 0 END )B1,

MAX(CASE rid WHEN 2 THEN b ELSE 0 END )B2,

MAX(CASE rid WHEN 3 THEN b ELSE 0 END  )B3-

FROM

(

   SELECT rid=ROW_NUMBER() OVER(PARTITION BY a ORDER BY b ),*

   FROM tb1

) AS T

GROUP BY a

 

 

 

drop table tb1