简化了的数据表数据ID NAME TEXT
1 NAME11 TEXT11
1 NAME12 TEXT12
1 NAME13 TEXT13
2 NAME21 ..
2 NAME22 ..
2 NAME23 ..
2 NAME24 ..
3 NAME31 ..
3 NAME32 ..
3 NAME33 ..
3 NAME34 ..
4 NAME41 ..
4 NAME42 ..查询结果
1 NAME11+TEXT11+NAME12+TEXT12+NAME13+TEXT13
2 NAME21+TEXT21+NAME22+TEXT22+NAME23+TEXT23+NAME24+TEXT24
3 ..
4 ..
把ID值一样的 拼接成一行 显示出来、
1 NAME11 TEXT11
1 NAME12 TEXT12
1 NAME13 TEXT13
2 NAME21 ..
2 NAME22 ..
2 NAME23 ..
2 NAME24 ..
3 NAME31 ..
3 NAME32 ..
3 NAME33 ..
3 NAME34 ..
4 NAME41 ..
4 NAME42 ..查询结果
1 NAME11+TEXT11+NAME12+TEXT12+NAME13+TEXT13
2 NAME21+TEXT21+NAME22+TEXT22+NAME23+TEXT23+NAME24+TEXT24
3 ..
4 ..
把ID值一样的 拼接成一行 显示出来、
原著:邹建
改编:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 2007-12-16 广东深圳表结构,数据如下:
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc需要得到结果:
id values
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加)1. 旧的解决方法(在sql server 2000中只能用函数解决。)
--1. 创建处理函数
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
goCREATE FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @r varchar(8000)
SET @r = ''
SELECT @r = @r + ',' + value FROM tb WHERE id=@id
RETURN STUFF(@r, 1, 1, '')
END
GO-- 调用函数
SELECt id, value = dbo.f_str(id) FROM tb GROUP BY iddrop table tb
drop function dbo.f_str/*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为 2 行)
*/--2、另外一种函数.
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go--创建一个合并的函数
create function f_hb(@id int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(value as varchar) from tb where id = @id
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 ,dbo.f_hb(id) as value from tbdrop table tb
drop function dbo.f_hb/*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为 2 行)
*/2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。)
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
-- 查询处理
SELECT * FROM(SELECT DISTINCT id FROM tb)A OUTER APPLY(
SELECT [values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM tb N
WHERE id = A.id
FOR XML AUTO
), '<N value="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb/*
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc(2 行受影响)
*/--SQL2005中的方法2
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
goselect id, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '')
from tb
group by id/*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc(2 row(s) affected)*/drop table tb
--2000中使用如下的函数,2005的方法见上.
create table tb(fCode varchar(10) , fName varchar(10) ,fQty int,fRe varchar(10))
insert into tb values('001' , '红色' , 500 , '大码')
insert into tb values('001' , '红色' , 300 , '小码')
go
--创建一个合并的函数
create function f_hb(@fCode varchar(10),@fName varchar(10))
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + '+' + cast(fRe as varchar) from tb where fCode=@fCode and fName = @fName
set @str = right(@str , len(@str) - 1)
return(@str)
End
go--调用自定义函数得到结果:
select distinct fCode ,fName , sum(fQty) fQty, dbo.f_hb(fCode ,fName) as fRee from tb group by fCode ,fNamedrop table tb
drop function dbo.f_hb/*
fCode fName fQty fRee
---------- ---------- ----------- ----------
001 红色 800 大码+小码(所影响的行数为 1 行)
速度慢的话,考虑优化吧。
-- -----------t_mac 小编-------------
---希望有天成为大虾----
-- =========================================IF OBJECT_ID('tb') IS NOT NULL
DROP TABLE tb
GO
CREATE TABLE tb(a int, b varchar(19),c varchar(10))
go
insert into tb
select
1 , 'NAME11' ,'TEXT11' union all select
1 , 'NAME12' ,'TEXT12' union all select
1 , 'NAME13' ,'TEXT13' union all select
2 , 'NAME21' , 'TEXT11' union all select
2 , 'NAME22' , 'TEXT21' union all select
2 , 'NAME23' ,'TEXT11' union all select
2 , 'NAME24' , 'TEXT13' union all select
3 , 'NAME31' ,'TEXT11' union all select
3 , 'NAME32' ,'TEXT18' union all select
3 , 'NAME33' , 'TEXT11' union all select
3 , 'NAME34' , 'TEXT12' union all select
4 , 'NAME41' , 'TEXT11' union all select
4 , 'NAME42' , 'TEXT15'
go
CREATE FUNCTION dbo.f_tb(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SET @str = ''
SELECT @str = @str + ',' + b+','+c FROM tb WHERE a=@id
RETURN STUFF(@str, 1, 1, '')
END
GO SELECT a, CardName = dbo.f_tb(a) FROM tb GROUP BY a
drop table tb
drop function dbo.f_tb
go/*------------
a CardName
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1 NAME11,TEXT11,NAME12,TEXT12,NAME13,TEXT13
2 NAME21,TEXT11,NAME22,TEXT21,NAME23,TEXT11,NAME24,TEXT13
3 NAME31,TEXT11,NAME32,TEXT18,NAME33,TEXT11,NAME34,TEXT12
4 NAME41,TEXT11,NAME42,TEXT15(4 行受影响)
-------*/
-- -----------t_mac 小编-------------
---希望有天成为大虾----
-- =========================================IF OBJECT_ID('tb') IS NOT NULL
DROP TABLE tb
GO
CREATE TABLE tb(a int, b varchar(100),c varchar(10))
go
insert into tb
select
1 , 'NAME11' ,'TEXT11' union all select
1 , 'NAME12' ,'TEXT12' union all select
1 , 'NAME13' ,'TEXT13' union all select
2 , 'NAME21' , 'TEXT11' union all select
2 , 'NAME22' , 'TEXT21' union all select
2 , 'NAME23' ,'TEXT11' union all select
2 , 'NAME24' , 'TEXT13' union all select
3 , 'NAME31' ,'TEXT11' union all select
3 , 'NAME32' ,'TEXT18' union all select
3 , 'NAME33' , 'TEXT11' union all select
3 , 'NAME34' , 'TEXT12' union all select
4 , 'NAME41' , 'TEXT11' union all select
4 , 'NAME42' , 'TEXT15'
go
SELECT a,b,c
INTO #t FROM tb
ORDER BY a,b,c
select * from #t DECLARE @col1 varchar(100),@col2 varchar(1000)
UPDATE #t
SET
@col2=CASE WHEN @col1=a THEN @col2+','+b+','+c ELSE B+c END,
@col1=a,
b=@col2
SELECT A,B=MAX(b) FROM #t group by a
/*------------
a CardName
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1 NAME11,TEXT11,NAME12,TEXT12,NAME13,TEXT13
2 NAME21,TEXT11,NAME22,TEXT21,NAME23,TEXT11,NAME24,TEXT13
3 NAME31,TEXT11,NAME32,TEXT18,NAME33,TEXT11,NAME34,TEXT12
4 NAME41,TEXT11,NAME42,TEXT15(4 行受影响)
-------*/
升级到sql2005可以用xml的方法...