请问这个SQL语句该怎么写

[czwwh]

表Table1，假设有两列
数据如下:
a1 b1
1001,1002 100.00
1001 120.00
1002 130.00

要求查出的结果如下
a1 b1
1001 100.00
1002 100.00
1001 120.00
1002 130.00

就是把第一行拆开来，a1列的数据是文本型，形式如下：1001,1002,1003
请高手指教，SQL语句该怎样写，谢谢

[chuanzhang5687]

拆分列值

[chuanzhang5687]

create table tb
(
	a1	varchar(100),
	b1	decimal(16,2)
)
insert into tb values('1001,1002',100.00)
insert into tb values('1001',120.00)
insert into tb values('1002',130.00)

SELECT  B.a1,A.b1 FROM
(
  SELECT b1, a1 = CONVERT(xml,'<root><v>' + REPLACE(a1, ',', '</v><v>') + '</v></root>') FROM tb
) A OUTER APPLY
(
  SELECT a1 = N.v.value('.', 'varchar(100)') FROM A.a1.nodes('/root/v') N(v)
) B
/*
a1,b1
1001,100.00
1002,100.00
1001,120.00
1002,130.00

(4 行受影响)

[chuanzhang5687]

参考

/*
标题：简单数据拆分(version 2.0)
作者：爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间：2010-05-07
地点：重庆航天职业学院
描述：

有表tb, 如下:
id          value
----------- -----------
1           aa,bb
2           aaa,bbb,ccc
欲按id,分拆value列, 分拆后结果如下:
id          value
----------- --------
1           aa
1           bb
2           aaa
2           bbb
2           ccc
*/

--1. 旧的解决方法(sql server 2000)

create table tb(id int,value varchar(30))
insert into tb values(1,'aa,bb')
insert into tb values(2,'aaa,bbb,ccc')
go

--方法1.使用临时表完成
SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b 

SELECT A.id, value = SUBSTRING(A.[value], B.id, CHARINDEX(',', A.[value] + ',', B.id) - B.id)
FROM tb A, # B
WHERE SUBSTRING(',' + A.[value], B.id, 1) = ','

DROP TABLE #

--方法2.如果数据量小，可不使用临时表
select a.id , value = substring(a.value , b.number , charindex(',' , a.value + ',' , b.number) - b.number) 
from tb a join master..spt_values  b 
on b.type='p' and b.number between 1 and len(a.value)
where substring(',' + a.value , b.number , 1) = ','

--2. 新的解决方法(sql server 2005)
create table tb(id int,value varchar(30))
insert into tb values(1,'aa,bb')
insert into tb values(2,'aaa,bbb,ccc')
go

--方法1.使用xml完成
SELECT A.id, B.value FROM
(
  SELECT id, [value] = CONVERT(xml,'<root><v>' + REPLACE([value], ',', '</v><v>') + '</v></root>') FROM tb
) A OUTER APPLY
(
  SELECT value = N.v.value('.', 'varchar(100)') FROM A.[value].nodes('/root/v') N(v)
) B

--方法2.使用CTE完成
;with tt as 
(select id,[value]=cast(left([value],charindex(',',[value]+',')-1) as nvarchar(100)),Split=cast(stuff([value]+',',1,charindex(',',[value]+','),'') as nvarchar(100)) from tb
union all
select id,[value]=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from tt where split>''
)
select id,[value] from tt order by id option (MAXRECURSION 0)


DROP TABLE tb

/*
id          value
----------- ------------------------------
1           aa
1           bb
2           aaa
2           bbb
2           ccc

(5 行受影响)
*/

[-晴天]

该贴的都贴了,楼主照着做就行了.

[--小F--]

--参考
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'
Go

--SQL2000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)=','
--2000不使用辅助表
Select
    a.Col1,COl2=substring(a.Col2,b.number,charindex(',',a.Col2+',',b.number)-b.number) 
from 
    Tab a join master..spt_values  b 
    ON B.type='p' AND B.number BETWEEN 1 AND LEN(A.col2)
where
     substring(','+a.COl2,b.number,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
*/

[小童]

[Quote=引用 2 楼 chuanzhang5687 的回复:]
SQL code



create table tb
(
a1 varchar(100),
b1 decimal(16,2)
)
insert into tb values('1001,1002',100.00)
insert into tb values('1001',120.00)
insert into tb values('1002',1……
[/Quote]+

[dawugui]

--sql 2000用临时表.

create table tb(a1 varchar(20),b1 decimal(18,2))
insert into tb values('1001,1002', 100.00)
insert into tb values('1001', 120.00)
insert into tb values('1002', 130.00)
go

SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b 

SELECT a1 = SUBSTRING(A.a1, B.id, CHARINDEX(',', A.a1 + ',', B.id) - B.id) , a.b1
FROM tb A, # B
WHERE SUBSTRING(',' + A.a1, B.id, 1) = ','

DROP TABLE #

drop table tb

/*
a1                   b1                   
-------------------- -------------------- 
1001                 100.00
1002                 100.00
1001                 120.00
1002                 130.00

（所影响的行数为 4 行）
*/

--sql 2000,如果数据量小，可不使用临时表

create table tb(a1 varchar(20),b1 decimal(18,2))
insert into tb values('1001,1002', 100.00)
insert into tb values('1001', 120.00)
insert into tb values('1002', 130.00)
go

select a1 = substring(a.a1 , b.number , charindex(',' , a.a1 + ',' , b.number) - b.number) , b1
from tb a join master..spt_values  b 
on b.type='p' and b.number between 1 and len(a.a1)
where substring(',' + a.a1 , b.number , 1) = ','

drop table tb

/*
a1                   b1                   
-------------------- -------------------- 
1001                 100.00
1002                 100.00
1001                 120.00
1002                 130.00

（所影响的行数为 4 行）
*/

[dawugui]

--sql 2005

create table tb(a1 varchar(20),b1 decimal(18,2))
insert into tb values('1001,1002', 100.00)
insert into tb values('1001', 120.00)
insert into tb values('1002', 130.00)
go

SELECT B.a1 , a.b1 FROM
(
  SELECT b1, a1 = CONVERT(xml,'<root><v>' + REPLACE(a1, ',', '</v><v>') + '</v></root>') FROM tb
) A OUTER APPLY
(
  SELECT a1 = N.v.value('.', 'varchar(100)') FROM A.a1.nodes('/root/v') N(v)
) B

drop table tb

/*
a1                                                                                                   b1
---------------------------------------------------------------------------------------------------- ---------------------------------------
1001                                                                                                 100.00
1002                                                                                                 100.00
1001                                                                                                 120.00
1002                                                                                                 130.00

(4 行受影响)
*/

[一直在冬眠]

学习了