参考--生成测试数据 create table 表(部门 int,人员 varchar(20)) insert into 表 select 1,'张三' insert into 表 select 1,'李四' insert into 表 select 1,'王五' insert into 表 select 2,'赵六' insert into 表 select 2,'邓七' insert into 表 select 2,'刘八' go--创建用户定义函数 create function f_str(@department int) returns varchar(8000) as begin declare @ret varchar(8000) set @ret = '' select @ret = @ret+','+人员 from 表 where 部门 = @department set @ret = stuff(@ret,1,1,'') return @ret end go --执行 select 部门,人员=dbo.f_str(部门) from 表 group by 部门 order by 部门 go--输出结果 /* 部门 人员 ---- -------------- 1 张三,李四,王五 2 赵六,邓七,刘八 */ --删除测试数据 drop function f_str drop table 表 go
--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--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 tbdrop 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 gocreate 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) goif 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 testdrop table tb drop table test--结果 id pr con OPS ---------- ---------- ---------- ------------------- 001 p c 差(6),好(2),一般(4) 002 w e 差(8),好(7),一般(1)(所影响的行数为 2 行)
见http://wenyzh.itpub.net/post/17729/96811
if object_id('pubs..tb') is not null drop table tb gocreate table tb ( COL_A char(1), COL_B int )insert into tb(COL_A,COL_B) values('A', 1) insert into tb(COL_A,COL_B) values('A', 3) insert into tb(COL_A,COL_B) values('A', 8) insert into tb(COL_A,COL_B) values('B', 2) insert into tb(COL_A,COL_B) values('B', 1) go--创建一个合并的函数 create function f_hb(@COL_A varchar(1)) returns varchar(8000) as begin declare @str varchar(8000) set @str = '' select @str = @str + ',' + cast(COL_B as varchar) from tb where COL_A = @COL_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 COL_A ,dbo.f_hb(COL_A) as COL_B from tbdrop table tbCOL_A COL_B ----- ------- A 1,3,8 B 2,1(所影响的行数为 2 行)
create table test(COL_A varchar(10),COL_B int) insert into test select 'A',1 insert into test select 'A',3 insert into test select 'A',8 insert into test select 'B',2 insert into test select 'B',1 go --创建用户定义函数 create function f_str(@COL_A varchar(10)) returns varchar(8000) as begin declare @ret varchar(8000) set @ret = '' select @ret = @ret+','+rtrim(COL_B) from test where COL_A = @COL_A set @ret = stuff(@ret,1,1,'') return @ret end go --执行 select COL_A,COL_B=dbo.f_str(COL_A) from test group by COL_A order by COL_A go/* COL_A COL_B ---------- --------- A 1,3,8 B 2,1 */drop function f_str drop table test go
create table 表(部门 int,人员 varchar(20))
insert into 表 select 1,'张三'
insert into 表 select 1,'李四'
insert into 表 select 1,'王五'
insert into 表 select 2,'赵六'
insert into 表 select 2,'邓七'
insert into 表 select 2,'刘八'
go--创建用户定义函数
create function f_str(@department int)
returns varchar(8000)
as
begin
declare @ret varchar(8000)
set @ret = ''
select @ret = @ret+','+人员 from 表 where 部门 = @department
set @ret = stuff(@ret,1,1,'')
return @ret
end
go
--执行
select 部门,人员=dbo.f_str(部门) from 表 group by 部门 order by 部门
go--输出结果
/*
部门 人员
---- --------------
1 张三,李四,王五
2 赵六,邓七,刘八
*/
--删除测试数据
drop function f_str
drop table 表
go
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--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 tbdrop 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
gocreate 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)
goif 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 testdrop table tb
drop table test--结果
id pr con OPS
---------- ---------- ---------- -------------------
001 p c 差(6),好(2),一般(4)
002 w e 差(8),好(7),一般(1)(所影响的行数为 2 行)
drop table tb
gocreate table tb
(
COL_A char(1),
COL_B int
)insert into tb(COL_A,COL_B) values('A', 1)
insert into tb(COL_A,COL_B) values('A', 3)
insert into tb(COL_A,COL_B) values('A', 8)
insert into tb(COL_A,COL_B) values('B', 2)
insert into tb(COL_A,COL_B) values('B', 1)
go--创建一个合并的函数
create function f_hb(@COL_A varchar(1))
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(COL_B as varchar) from tb where COL_A = @COL_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 COL_A ,dbo.f_hb(COL_A) as COL_B from tbdrop table tbCOL_A COL_B
----- -------
A 1,3,8
B 2,1(所影响的行数为 2 行)
insert into test select 'A',1
insert into test select 'A',3
insert into test select 'A',8
insert into test select 'B',2
insert into test select 'B',1
go
--创建用户定义函数
create function f_str(@COL_A varchar(10))
returns varchar(8000)
as
begin
declare @ret varchar(8000)
set @ret = ''
select @ret = @ret+','+rtrim(COL_B) from test where COL_A = @COL_A
set @ret = stuff(@ret,1,1,'')
return @ret
end
go
--执行
select COL_A,COL_B=dbo.f_str(COL_A) from test group by COL_A order by COL_A
go/*
COL_A COL_B
---------- ---------
A 1,3,8
B 2,1
*/drop function f_str
drop table test
go