求SQL语句实现子查询功能!

--合并分拆表
/******************************************************************************************************************************************************
合并分拆表数据整理人：中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/--> --> (Roy)生成測試數據

if not object_id('Tab') is null
    drop table Tab
Go
Create table Tab([Col1] int,[Col2] nvarchar(1))
Insert Tab
select 1,N'a' union all
select 1,N'b' union all
select 1,N'c' union all
select 2,N'd' union all
select 2,N'e' union all
select 3,N'f'
Go合并表:SQL2000用函数:go
if object_id('F_Str') is not null
    drop function F_Str
go
create function F_Str(@Col1 int)
returns nvarchar(100)
as
begin
    declare @S nvarchar(100)
    select @S=isnull(@S+',','')+Col2 from Tab where Col1=@Col1
    return @S
end
go
Select distinct Col1,Col2=dbo.F_Str(Col1) from TabgoSQL2005用XML:方法1:select
    a.Col1,Col2=stuff(b.Col2.value('/R[1]','nvarchar(max)'),1,1,'')
from
    (select distinct COl1 from Tab) a
Cross apply
    (select COl2=(select N','+Col2 from Tab where Col1=a.COl1 For XML PATH(''), ROOT('R'), TYPE))b方法2:select
    a.Col1,COl2=replace(b.Col2.value('/Tab[1]','nvarchar(max)'),char(44)+char(32),char(44))
from
    (select distinct COl1 from Tab) a
cross apply
    (select Col2=(select COl2 from Tab  where COl1=a.COl1 FOR XML AUTO, TYPE)
                .query('<Tab>
                {for $i in /Tab[position()<last()]/@COl2 return concat(string($i),",")}
                {concat("",string(/Tab[last()]/@COl2))}
                </Tab>')
                )bSQL05用CTE:;with roy as(select Col1,Col2,row=row_number()over(partition by COl1 order by COl1) from Tab)
,Roy2 as
(select COl1,cast(COl2 as nvarchar(100))COl2,row from Roy where row=1
union all
select a.Col1,cast(b.COl2+','+a.COl2 as nvarchar(100)),a.row from Roy a join Roy2 b on a.COl1=b.COl1 and a.row=b.row+1)
select Col1,Col2 from Roy2 a where row=(select max(row) from roy where Col1=a.COl1) order by Col1 option (MAXRECURSION 0)
生成结果:
/*
Col1        COl2
----------- ------------
1           a,b,c
2           d,e
3           f(3 行受影响)
*/
拆分表:--> --> (Roy)生成測試數據

if not object_id('Tab') is null
    drop table Tab
Go
Create table Tab([Col1] int,[COl2] nvarchar(5))
Insert Tab
select 1,N'a,b,c' union all
select 2,N'd,e' union all
select 3,N'f'
GoSQL2000用辅助表:
if object_id('Tempdb..#Num') is not null
    drop table #Num
go
select top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns b
Select
    a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID)
from
    Tab a,#Num b
where
    charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=','
SQL2005用Xml:select
    a.COl1,b.Col2
from
    (select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)a
outer apply
    (select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))b
SQL05用CTE:;with roy as
(select Col1,COl2=cast(left(Col2,charindex(',',Col2+',')-1) as nvarchar(100)),Split=cast(stuff(COl2+',',1,charindex(',',Col2+','),'') as nvarchar(100)) from Tab
union all
select Col1,COl2=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from Roy where split>''
)
select COl1,COl2 from roy order by COl1 option (MAXRECURSION 0)生成结果:
/*
Col1        COl2
----------- -----
1           a
1           b
1           c
2           d
2           e
3           f
*/

合并列值
--*******************************************************************************************
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。)
--=============================================================================
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
--1. 创建处理函数
CREATE FUNCTION dbo.f_strUnite(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + value FROM tb WHERE id=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO
-- 调用函数
SELECt id, value = dbo.f_strUnite(id) FROM tb GROUP BY id
drop table tb
drop function dbo.f_strUnite
go
/*
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')
go select 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

SQL code问题描述：
无论是在sql 2000，还是在 sql 2005 中,都没有提供字符串的聚合函数，
  所以，当我们在处理下列要求时，会比较麻烦：
有表tb, 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-- 1. 创建处理函数
CREATE 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, values=dbo.f_str(id)
FROM tb
GROUP BY id-- 2.1 新的解决方法
-- 示例数据
DECLARE @t TABLE(id int, value varchar(10))
INSERT @t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'-- 查询处理
SELECT *
FROM(
    SELECT DISTINCT
        id
    FROM @t
)A
OUTER APPLY(
    SELECT
        [values]= STUFF(REPLACE(REPLACE(
            (
                SELECT value FROM @t N
                WHERE id = A.id
                FOR XML AUTO
            ), '<N value="', ','), '"/>', ''), 1, 1, '')
)N/*--结果
id          values
----------- ----------------
1           aa,bb
2           aaa,bbb,ccc
(2 行受影响)
--*/
--2.2
DECLARE @TB TABLE([Name] VARCHAR(1), [Value] VARCHAR(6))
INSERT @TB
SELECT 'A', '123' UNION ALL
SELECT 'A', '677' UNION ALL
SELECT 'B', 'HHDA' UNION ALL
SELECT 'B', 'JYUKY' UNION ALL
SELECT 'B', 'WRWFCW' UNION ALL
SELECT 'B', 'YUYUY' UNION ALL
SELECT 'C', 'TRREER'SELECT [Name],STUFF((SELECT  ','+[Value] FROM @TB WHERE NAME=A.NAME FOR XML PATH('')),1,1,'') AS [Value]
FROM @TB AS A
GROUP BY [Name]
/*
Name Value
---- ------------------------------------------
A    123,677
B    HHDA,JYUKY,WRWFCW,YUYUY
C    TRREER
*/--各种字符串分函数--3.3.1 使用游标法进行字符串合并处理的示例。
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3--合并处理
--定义结果集表变量
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))--定义游标并进行合并处理
DECLARE tb CURSOR LOCAL
FOR
SELECT col1,col2 FROM tb ORDER BY  col1,col2
DECLARE @col1_old varchar(10),@col1 varchar(10),@col2 int,@s varchar(100)
OPEN tb
FETCH tb INTO @col1,@col2
SELECT @col1_old=@col1,@s=''
WHILE @@FETCH_STATUS=0
BEGIN
    IF @col1=@col1_old
        SELECT @s=@s+','+CAST(@col2 as varchar)
    ELSE
    BEGIN
        INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
        SELECT @s=','+CAST(@col2 as varchar),@col1_old=@col1
    END
    FETCH tb INTO @col1,@col2
END
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
CLOSE tb
DEALLOCATE tb
--显示结果并删除测试数据
SELECT * FROM @t
DROP TABLE tb
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
GO
/*==============================================*/
--3.3.2 使用用户定义函数，配合SELECT处理完成字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
GO--合并处理函数
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
    DECLARE @re varchar(100)
    SET @re=''
    SELECT @re=@re+','+CAST(col2 as varchar)
    FROM tb
    WHERE col1=@col1
    RETURN(STUFF(@re,1,1,''))
END
GO--调用函数
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--删除测试
DROP TABLE tb
DROP FUNCTION f_str
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
GO/*==============================================*/
--3.3.3 使用临时表实现字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3--合并处理
SELECT col1,col2=CAST(col2 as varchar(100))
INTO #t FROM tb
ORDER BY col1,col2
DECLARE @col1 varchar(10),@col2 varchar(100)
UPDATE #t SET
    @col2=CASE WHEN @col1=col1 THEN @col2+','+col2 ELSE col2 END,
    @col1=col1,
    col2=@col2
SELECT * FROM #t
/*--更新处理后的临时表
col1       col2
---------- -------------
a          1
a          1,2
b          1
b          1,2
b          1,2,3
--*/
--得到最终结果
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--结果
col1       col2
---------- -----------
a          1,2
b          1,2,3
--*/
--删除测试
DROP TABLE tb,#t
GO
/*==============================================*/--3.3.4.1 每组 <=2 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'c',3--合并处理
SELECT col1,
    col2=CAST(MIN(col2) as varchar)
        +CASE
            WHEN COUNT(*)=1 THEN ''
            ELSE ','+CAST(MAX(col2) as varchar)
        END
FROM tb
GROUP BY col1
DROP TABLE tb
/*--结果
col1       col2
---------- ----------
a          1,2
b          1,2
c          3
--*/--3.3.4.2 每组 <=3 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
UNION ALL SELECT 'c',3--合并处理
SELECT col1,
    col2=CAST(MIN(col2) as varchar)
        +CASE
            WHEN COUNT(*)=3 THEN ','
                +CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar)
            ELSE ''
        END
        +CASE
            WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar)
            ELSE ''
        END
FROM tb a
GROUP BY col1
DROP TABLE tb
/*--结果
col1       col2
---------- ------------
a          1,2
b          1,2,3
c          3
--*/
GO
if not object_id('A') is null
    drop table A
Go
Create table A([id] int,[cname] nvarchar(2))
Insert A
select 1,N'张三' union all
select 2,N'李四' union all
select 3,N'王五' union all
select 4,N'蔡六'
Go
--> -->

if not object_id('B') is null
    drop table B
Go
Create table B([id] int,[cname] nvarchar(5))
Insert B
select 1,N'1,2,3' union all
select 2,N'3,4'
Go
create function F_str(@cname nvarchar(100))
returns nvarchar(100)
as
begin
select @cname=replace(@cname,ID,[cname]) from A where patindex('%,'+rtrim(ID)+',%',','+@cname+',')>0
return @cname
end
go
select [id],dbo.F_str([cname])[cname] from Bid          cname
----------- ----------------------------------------------------------------------------------------------------
1           张三,李四,王五
2           王五,蔡六(2 個資料列受到影響)

CREATE FUNCTION dbo.f_tb(@id varchar(10))
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + tname FROM table1 WHERE tcode=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO SELECT
单据号=a.tcode,
单据使用人=b.tuser,
单据内容 = dbo.f_tb(tcode)
FROM table1 a join table2 b on a.tcode=b.tcode
GROUP BY a.tcode ,b.tuser

CREATE FUNCTION dbo.f_tb(@id varchar(10))
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + tname FROM table1 WHERE tcode=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO SELECT
单据号=a.tcode,
单据使用人=b.tuser,
单据内容 = dbo.f_tb(tcode)
FROM  table1 a join table2 b on a.tcode=b.tcode

create table tb (a varchar(10),b varchar(10))
insert tb
select '2009', 'AA' union all
select '2009', 'BB' union all
select '2008', 'CC' union all
select '2007', 'XX' union all
select '2009', 'HH' union all
select '2008', 'DD' union all
select '2007', 'SS' union all
select '2006', 'GG'
go
select * from tb
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
    DECLARE @re varchar(100)
    SET @re=''
    SELECT @re=@re+','+CAST(b as varchar)
    FROM tb
    WHERE a=@col1
    RETURN(STUFF(@re,1,1,''))
END
GOselect a,dbo.f_str(a)[b] from tb group by a a          b
---------- -------------------
2006       GG
2007       XX,SS
2008       CC,DD
2009       AA,BB,HH（所影响的行数为 4 行）

http://blog.csdn.net/lihan6415151528/archive/2009/08/10/4431237.aspx

-- =========================================
-- -----------t_mac 小编-------------------
   --------------------希望有天成为大虾----
-- =========================================IF OBJECT_ID('table1') IS NOT NULL
DROP TABLE table1
GO
CREATE TABLE table1(tcode varchar(10), tname  varchar(10) )
go
insert table1 SELECT
'001' , 'aaa' UNION ALL SELECT
'001' , 'bbb' UNION ALL SELECT
'001' , 'ccc' UNION ALL SELECT
'002' , 'ddd' UNION ALL SELECT
'002' , 'eee' UNION ALL SELECT
'002' , 'fff'
IF OBJECT_ID('table2') IS NOT NULL
DROP TABLE table2
GO
CREATE TABLE table2(tcode varchar(10), tuser   varchar(10) )
go
insert table2 SELECT
'001'  ,'A1' UNION ALL SELECT
'002'  ,'A2'
go
CREATE FUNCTION dbo.f_tb(@id varchar(10))
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + tname FROM table1 WHERE tcode=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO SELECT
单据号=a.tcode,
单据使用人=b.tuser,
单据内容 = dbo.f_tb(a.tcode)
FROM  table1 a join table2 b on a.tcode=b.tcode
GROUP BY a.tcode ,b.tuser

单据号        单据使用人      单据内容
---------- ---------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
001        A1         aaa,bbb,ccc
002        A2         ddd,eee,fff(2 行受影响)
修改了下

--> 测试数据: [table1]
if object_id('[table1]') is not null drop table [table1]
create table [table1] (tcode varchar(3),tname varchar(3))
insert into [table1]
select '001','aaa' union all
select '001','bbb' union all
select '001','ccc' union all
select '002','ddd' union all
select '002','eee' union all
select '002','fff'
--> 测试数据: [table2]
if object_id('[table2]') is not null drop table [table2]
create table [table2] (tcode varchar(3),tuser varchar(2))
insert into [table2]
select '001','A1' union all
select '002','A2'
go--1. 创建处理函数
CREATE FUNCTION dbo.f_strUnite(@tcode int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SELECT @str = isnull(@str + ',','') + tname FROM [table1] WHERE tcode=@tcode
return @str
END
GO select *,dbo.f_strUnite(tcode) from table2

--2005的方法SELECT
单据号=a.tcode,
单据使用人=b.tuser,
单据内容 = STUFF((select ','+tname  from table1 where a.tcode=tcode for xml path('')),1,1,'')
FROM  table1 a join table2 b on a.tcode=b.tcode
group by a.tcode, b.tuser单据号        单据使用人      单据内容
---------- ---------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
001        A1         aaa,bbb,ccc
002        A2         ddd,eee,fff

CREATE TABLE TBTEST(tcode VARCHAR(10), tname VARCHAR(10))
INSERT TBTEST
SELECT '001' , 'aaa' UNION ALL
SELECT '001' , 'bbb' UNION ALL
SELECT '001' , 'ccc' UNION ALL
SELECT '002' , 'ddd' UNION ALL
SELECT '002' , 'eee' UNION ALL
SELECT '002' , 'fff'CREATE TABLE TBTEST1(tcode VARCHAR(10),tuser VARCHAR(10))
INSERT TBTEST1
SELECT '001' , 'A1' UNION ALL
SELECT '001' , 'A2'
CREATE FUNCTION dbo.f_strUnite(@tcode int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + LTRIM(tname) FROM TBTEST  WHERE tcode=@tcode
    RETURN STUFF(@str, 1, 1, '')
END
GO SELECT T.tcode,T1.tuser,dbo.f_strUnite(T.tcode) FROM
TBTEST T ,TBTEST1 T1 WHERE T.tcode=T1.tcode GROUP BY T.tcode,tuser
tcode      tuser
---------- ---------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
001        A1         aaa,bbb,ccc
001        A2         aaa,bbb,ccc（所影响的行数为 2 行）

IF OBJECT_ID('table1') IS NOT NULL
DROP TABLE table1
GO
CREATE TABLE table1(tcode varchar(10), tname  varchar(10) )
go
insert table1 SELECT
'001' , 'aaa' UNION ALL SELECT
'001' , 'bbb' UNION ALL SELECT
'001' , 'ccc' UNION ALL SELECT
'002' , 'ddd' UNION ALL SELECT
'002' , 'eee' UNION ALL SELECT
'002' , 'fff'
IF OBJECT_ID('table2') IS NOT NULL
DROP TABLE table2
GO
CREATE TABLE table2(tcode varchar(10), tuser   varchar(10) )
go
insert table2 SELECT
'001'  ,'A1' UNION ALL SELECT
'002'  ,'A2'
go
alter function dbo.f_hb(@id varchar(10))
returns varchar(8000)
as
  begin
   declare @sql varchar(8000)
   set @sql=''
    select @sql=@sql+','+tname from table1 where  tcode=@id
   return stuff(@sql,1,1,'')
  endselect a.tcode as 单据号,
       a.tuser as 单据使用人,
       b.tname as 单据内容 from  table2 as a
left join
(
select tcode,dbo.f_hb(tcode) as tname from table1 group by tcode)b
on a.tcode=b.tcode
/*
单据号        单据使用人      单据内容
---------- ---------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
001        A1         aaa,bbb,ccc
002        A2         ddd,eee,fff(2 行受影响)*/

----------------------------------------------------------------
-- Author :fredrickhu(小F 向高手学习)
-- Date   :2009-08-15 10:10:39
----------------------------------------------------------------
--> 测试数据：[table1]
if object_id('[table1]') is not null drop table [table1]
go
create table [table1]([tcode] varchar(3),[tname] varchar(3))
insert [table1]
select '001','aaa' union all
select '001','bbb' union all
select '001','ccc' union all
select '002','ddd' union all
select '002','eee' union all
select '002','fff'
--> 测试数据：[table2]
if object_id('[table2]') is not null drop table [table2]
go
create table [table2]([tcode] varchar(3),[tuser] varchar(2))
insert [table2]
select '001','A1' union all
select '002','A2'
--------------开始查询--------------------------
CREATE FUNCTION dbo.f_tb(@id varchar(10))
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str = ''
    SELECT @str = @str + ',' + tname FROM table1 WHERE tcode=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO
-- 调用函数
select
  a.tcode, b.tuser,
  tname = dbo.f_tb(a.tcode)
FROM
  table1 a ,table2 b
where
  a.tcode=b.tcode
GROUP BY
  a.tcode,b.tuser
drop table table1
drop table table2
drop function dbo.f_strUnite
go----------------结果----------------------------
/*tcode tuser tname
----- ----- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
001   A1    aaa,bbb,ccc
002   A2    ddd,eee,fff（所影响的行数为 2 行）*/

没有2005的环境楼主自己去写下
就是一个join on就行了很简单的

调试易

求SQL语句实现子查询功能!

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