求一SQL

[CareEarth]

表A：
id c1 c2 c3
1 a b d
2 b tt dd
3 c er z
表B与表A通过id关联
表B：
id co1 co2 co3
1 fd ds dsd
1 ee kk hh
2 dj jj ll
2 di dn dh
2 dl kf lj
3 dd zz lz
期望结果：
id c1 c2 c3 co1 co2 co3
1 a b d fd ee ds kk dsd hh
2 b tt dd dj di dl jj dn kf ll dh lj
3 c er z dd zz lz

[htl258_Tony]

表B那些按用空格接的吗?

[htl258_Tony]

--------------------------------------------------------------------------
--  Author : htl258(Tony)
--  Date   : 2010-04-02 19:05:02
--  Version:Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (Intel X86) 
--          Mar 29 2009 10:27:29 
--          Copyright (c) 1988-2008 Microsoft Corporation
--          Developer Edition on Windows NT 5.1 <X86> (Build 2600: Service Pack 2)
--------------------------------------------------------------------------
--> 生成测试数据表:a

IF NOT OBJECT_ID('[a]') IS NULL
	DROP TABLE [a]
GO
CREATE TABLE [a]([id] INT,[c1] NVARCHAR(10),[c2] NVARCHAR(10),[c3] NVARCHAR(10))
INSERT [a]
SELECT 1,'a','b','d' UNION ALL
SELECT 2,'b','tt','dd' UNION ALL
SELECT 3,'c','er','z'
GO
--SELECT * FROM [a]

--> 生成测试数据表:b

IF NOT OBJECT_ID('[b]') IS NULL
	DROP TABLE [b]
GO
CREATE TABLE [b]([id] INT,[co1] NVARCHAR(10),[co2] NVARCHAR(10),[co3] NVARCHAR(10))
INSERT [b]
SELECT 1,'fd','ds','dsd' UNION ALL
SELECT 1,'ee','kk','hh' UNION ALL
SELECT 2,'dj','jj','ll' UNION ALL
SELECT 2,'di','dn','dh' UNION ALL
SELECT 2,'dl','kf','lj' UNION ALL
SELECT 3,'dd','zz','lz'
GO
--SELECT * FROM [b]

-->SQL查询如下:

if object_id('dbo.f_str') is not null drop function dbo.f_str
 go 
create function dbo.f_str(@id int,@type int) 
returns varchar(100)
as
begin
    declare @str varchar(1000)
    select @str = isnull(@str + ' ','') 
		+ ltrim(case @type when 1 then [co1] when 2 then [co2] else [co3] end) 
	from b 
    where  id= @id
    return @str
end
go

select *,dbo.f_str(id,1) [co1],dbo.f_str(id,2) [co2],dbo.f_str(id,3) [co3] from a

/*
id	c1	c2	c3	co1	co2	co3
1	a	b	d	fd ee	ds kk	dsd hh
2	b	tt	dd	dj di dl	jj dn kf	ll dh lj
3	c	er	z	dd	zz	lz
*/

[东那个升]

IF NOT OBJECT_ID('[a]') IS NULL
    DROP TABLE [a]
GO
CREATE TABLE [a]([id] INT,[c1] NVARCHAR(10),[c2] NVARCHAR(10),[c3] NVARCHAR(10))
INSERT [a]
SELECT 1,'a','b','d' UNION ALL
SELECT 2,'b','tt','dd' UNION ALL
SELECT 3,'c','er','z'
GO
--SELECT * FROM [a]

--> 生成测试数据表:b

IF NOT OBJECT_ID('[b]') IS NULL
    DROP TABLE [b]
GO
CREATE TABLE [b]([id] INT,[co1] NVARCHAR(10),[co2] NVARCHAR(10),[co3] NVARCHAR(10))
INSERT [b]
SELECT 1,'fd','ds','dsd' UNION ALL
SELECT 1,'ee','kk','hh' UNION ALL
SELECT 2,'dj','jj','ll' UNION ALL
SELECT 2,'di','dn','dh' UNION ALL
SELECT 2,'dl','kf','lj' UNION ALL
SELECT 3,'dd','zz','lz'
GO

select a.*,b.co1,b.co2,b.co3 from [a] inner join (
							select id
							,stuff((select ' '+co1 from [b] where a.id=b.id for xml path('')),1,1,'') as co1
							,stuff((select ' '+co2 from [b] where a.id=b.id for xml path('')),1,1,'')  as co2
							,stuff((select ' '+co3 from [b] where a.id=b.id for xml path('')),1,1,'')  as co3
							from [b] a
							group by id) b on a.id=b.id

         id c1         c2         c3         co1                  co2                  co3
----------- ---------- ---------- ---------- -------------------- -------------------- --------------------
          1 a          b          d          fd ee                ds kk                dsd hh
          2 b          tt         dd         dj di dl             jj dn kf             ll dh lj
          3 c          er         z          dd                   zz                   lz

(3 行受影响)

盗用TONY哥的建表。

[dawugui]

/*
标题：按某字段合并字符串之一(简单合并)
作者：爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间：2008-11-06
地点：广东深圳

描述：将如下形式的数据按id字段合并value字段。
id    value
----- ------
1     aa
1     bb
2     aaa
2     bbb
2     ccc
需要得到结果：
id     value
------ -----------
1      aa,bb
2      aaa,bbb,ccc
即：group by id, 求 value 的和（字符串相加）
*/
--1、sql2000中只能用自定义的函数解决
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

create function dbo.f_str(@id int) returns varchar(100)
as
begin
    declare @str varchar(1000)
    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

--调用函数
select id , value = dbo.f_str(id) from tb group by id

drop function dbo.f_str
drop table tb


--2、sql2005中的方法
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

select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')
from tb
group by id

drop table tb


--3、使用游标合并数据
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
declare @t table(id int,value varchar(100))--定义结果集表变量
--定义游标并进行合并处理
declare my_cursor cursor local for
select id , value from tb
declare @id_old int , @id int , @value varchar(10) , @s varchar(100)
open my_cursor
fetch my_cursor into @id , @value
select @id_old = @id , @s=''
while @@FETCH_STATUS = 0
begin
    if @id = @id_old
       select @s = @s + ',' + cast(@value as varchar)
    else
      begin
        insert @t values(@id_old , stuff(@s,1,1,''))
        select @s = ',' + cast(@value as varchar) , @id_old = @id
      end
    fetch my_cursor into @id , @value
END
insert @t values(@id_old , stuff(@s,1,1,''))
close my_cursor
deallocate my_cursor

select * from @t
drop table tb

[永生天地]

精华推荐

[让你望见影子的墙]

先进行字符合并，然后再进行连接