sql简单问题一对多数据合并

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)

/******************************************************************************************************************************************************
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 Tab go SQL2005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>')
                )b SQL05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)
*/

CREATE FUNCTION dbo.f_tb(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str =''
    SELECT @str = @str +',' +VARID+'_'+VARNAME FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T WHERE CardNo=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO SELECT ID, CardName = dbo.f_tb(ID) FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T GROUP BY ID
go

。。太长了看不明白
我只需要一个返回table的函数函数一定要返回table
根据我的例子帮忙弄下吧！

-- =========================================
-- -----------t_mac 小编-------------
   ---希望有天成为大虾----
-- =========================================IF OBJECT_ID('A') IS NOT NULL
  DROP TABLE A
GO
CREATE TABLE A(ID INT,VARID VARCHAR(10))
go
insert A SELECT 1,'001'
UNION ALL SELECT 2,'002'
UNION ALL SELECT 3,'003'
GO
IF OBJECT_ID('B') IS NOT NULL
  DROP TABLE B
GO
CREATE TABLE B(VARID VARCHAR(10),VARNAME VARCHAR(10))
go
insert B SELECT '001','NAME1'
UNION ALL SELECT '002','NAME2'
UNION ALL SELECT '003','NAME3'
GOCREATE FUNCTION dbo.f_tb(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str =''
    SELECT @str = @str +',' +VARID+'_'+VARNAME FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T WHERE ID=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO
SELECT ID, CardName = dbo.f_tb(ID) FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T GROUP BY IDgo
/*------------
ID          CardName
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1           001_NAME1
2           002_NAME2
3           003_NAME3-------*/

-- =========================================
-- -----------t_mac 小编-------------
   ---希望有天成为大虾----
-- =========================================IF OBJECT_ID('A') IS NOT NULL
  DROP TABLE A
GO
CREATE TABLE A(ID INT,VARID VARCHAR(10))
go
insert A SELECT 1,'001'
UNION ALL SELECT 1,'002'
UNION ALL SELECT 1,'003'
GO
IF OBJECT_ID('B') IS NOT NULL
  DROP TABLE B
GO
CREATE TABLE B(VARID VARCHAR(10),VARNAME VARCHAR(10))
go
insert B SELECT '001','NAME1'
UNION ALL SELECT '002','NAME2'
UNION ALL SELECT '003','NAME3'
GOCREATE FUNCTION dbo.f_tb(@id int)
RETURNS varchar(8000)
AS
BEGIN
    DECLARE @str varchar(8000)
    SET @str =''
    SELECT @str = @str +',' +VARID+'_'+VARNAME FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T WHERE ID=@id
    RETURN STUFF(@str, 1, 1, '')
END
GO
SELECT ID, CardName = dbo.f_tb(ID) FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T GROUP BY IDgo
/*------------
ID          CardName
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1           001_NAME1,002_NAME2,003_NAME3-------*/

CREATE FUNCTION dbo.f_tb(@id int)
RETURNS varchar(8000)
中的 RETURNS varchar(8000) 能换成个table 么？不然我在函数外还得查一遍

你的函数无论如何都要在外面进行select 的即使你返回表值

-- =========================================
-- -----------t_mac 小编-------------
   ---希望有天成为大虾----
-- =========================================IF OBJECT_ID('A') IS NOT NULL
  DROP TABLE A
GO
CREATE TABLE A(ID INT,VARID VARCHAR(10))
go
insert A SELECT 1,'001'
UNION ALL SELECT 1,'002'
UNION ALL SELECT 1,'003'
GO
IF OBJECT_ID('B') IS NOT NULL
  DROP TABLE B
GO
CREATE TABLE B(VARID VARCHAR(10),VARNAME VARCHAR(10))
go
insert B SELECT '001','NAME1'
UNION ALL SELECT '002','NAME2'
UNION ALL SELECT '003','NAME3'
GOCREATE FUNCTION dbo.f_tb(@id int)
RETURNS @s table(id int,s  varchar(100))
AS
BEGIN
    DECLARE @str varchar(8000)
    SELECT  @str = isnull(@str +',','')+VARID+'_'+VARNAME FROM (select id ,A.VARID VARID , VARNAME FROM A JOIN B ON A.VARID=B.VARID) T where Id=@id
     insert @s
    values(@id,@str)
    return
END
GO SELECT * from dbo.f_tb(1)id          s
----------- ----------------------------------------------------------------------------------------------------
1           001_NAME1,002_NAME2,003_NAME3(1 行受影响)go
网卡休息了下

调试易

sql简单问题一对多数据合并

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sql简单问题 一对多数据合并

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sql简单问题一对多数据合并