日期:2014-05-18 浏览次数:20556 次
USE tempdb go create table a ( a varchar(20) not null , b varchar (20) not null, c varchar (20) null ) insert into a select 'A1','B1','C1' UNION SELECT 'A2','B2','C2' UNION SELECT 'A2','B3','C3' UNION SELECT 'A1','B4','C4' go ;with t1 as (select row_number()over(PARTITION by a order by a) as rn,* from a) select a.a,a.b,a.c,b.b,b.c from t1 as a left join t1 as b on a.a=b.a and a.rn=b.rn-1 where a.rn%2=1 /* a b c b c A1 B1 C1 B4 C4 A2 B2 C2 B3 C3 */
------解决方案--------------------
select c.a as col1,c.b as col2,c.c as col3,b.b as col4,b.c as col5 from a c left join a b on c.a=b.a where b.b>c.b /* col1 col2 col3 col4 col5 -------------------- -------------------- -------------------- -------------------- -------------------- A1 B1 C1 B4 C4 A2 B2 C2 B3 C3 */
------解决方案--------------------
SQL2000这样用 USE tempdb go create table a ( a varchar(20) not null , b varchar (20) not null, c varchar (20) null ) insert into a select 'A1','B1','C1' UNION SELECT 'A2','B2','C2' UNION SELECT 'A2','B3','C3' UNION SELECT 'A1','B4','C4' go select rn=identity(int,1,1),a,b,c into # from a select a.a,a.b,a.c,b.b,b.c from (select a,b,c,rn=(select COUNT(*) from # where a=a.a and rn<=a.rn) from # as a) as a left join (select a,b,c,rn=(select COUNT(*) from # where a=a.a and rn<=a.rn) from # as a) as b on a.a=b.a and a.rn=b.rn-1 where a.rn%2=1