aa bb
1736 854
1736 855
1738 856
1738 857
1740 858
1740 859
1740 860
想得到
cc dd
1736 854,855
1738 856,857
1740 858,859,860
------解决方案--------------------
--带符号合并行列转换
--有表t,其数据如下:
a b
1 1
1 2
1 3
2 1
2 2
3 1
--如何转换成如下结果:
a b
1 1,2,3
2 1,2
3 1
create table tb
(
a int,
b int
)
insert into tb(a,b) values(1,1)
insert into tb(a,b) values(1,2)
insert into tb(a,b) values(1,3)
insert into tb(a,b) values(2,1)
insert into tb(a,b) values(2,2)
insert into tb(a,b) values(3,1)
go
if object_id( 'pubs..f_hb ') is not null
drop function f_hb
go
--创建一个合并的函数
create function f_hb(@a int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ' '
select @str = @str + ', ' + cast(b as varchar) from tb where a = @a
set @str = right(@str , len(@str) - 1)
return(@str)
End
go
--调用自定义函数得到结果:
select distinct a ,dbo.f_hb(a) as b from tb
drop table tb
--结果
a b
----------- ------
1 1,2,3
2 1,2
3 1
(所影响的行数为 3 行)
多个前列的合并
数据的原始状态如下:
ID PR CON OP SC
001 p c 差 6
001 p c 好 2
001 p c 一般 4
002 w e 差 8
002 w e 好 7
002 w e 一般 1
===========================
用SQL语句实现,变成如下的数据
ID PR CON OPS
001 p c 差(6),好(2),一般(4)
002 w e 差(8),好(7),一般(1)
if object_id( 'pubs..tb ') is not null
drop table tb
go
create table tb
(
id varchar(10),
pr varchar(10),
con varchar(10),
op varchar(10),
sc int
)
insert into tb(ID,PR,CON,OP,SC) values( '001 ', 'p ', 'c ', '差 ', 6)
insert into tb(ID,PR,CON,OP,SC) values( '001 ', 'p ', 'c ', '好 ', 2)
insert into tb(ID,PR,CON,OP,SC) values( '001 ', 'p ', 'c ', '一般 ', 4)
insert into tb(ID,PR,CON,OP,SC) values( '002 ', 'w ', 'e ', '差 ', 8)
insert into tb(ID,PR,CON,OP,SC) values( '002 ', 'w ', 'e ', '好 ', 7)
insert into tb(ID,PR,CON,OP,SC) values( '002 ', 'w ', 'e ', '一般 ', 1)
go
if object_id( 'pubs..test ') is not null
drop table test
go
select ID,PR,CON , OPS = op + '( ' + cast(sc as varchar(10)) + ') ' into test from tb
--创建一个合并的函数
if object_id( 'pubs..f_hb ') is not null
drop function f_hb
go
create function f_hb(@id varchar(10),@pr varchar(10),@con varchar(10))
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ' '
select @str = @str + ', ' + cast(OPS as varchar) from test where id = @id and @pr = pr and @con = con
set @str = right(@str , len(@str) - 1)
return(@str)
End
go
--调用自定义函数得到结果:
select distinct id ,pr , con , dbo.f_hb(id,pr,con) as OPS from test
drop table tb
drop table test