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 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) SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b SELECT A.id, SUBSTRING(A.[values], B.id, CHARINDEX(',', A.[values] + ',', B.id) - B.id) FROM tb A, # B WHERE SUBSTRING(',' + A.[values], B.id, 1) = ',' DROP TABLE # 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 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 DROP TABLE tb /* id value ----------- ------------------------------ 1 aa 1 bb 2 aaa 2 bbb 2 ccc
---------------------------------------------------------------- -- Author :SQL77(只为思齐老) -- Date :2010-01-14 18:54:09 -- Version: -- Microsoft SQL Server 2000 - 8.00.194 (Intel X86) -- Aug 6 2000 00:57:48 -- Copyright (c) 1988-2000 Microsoft Corporation -- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3) -- ---------------------------------------------------------------- --> 测试数据:#A if object_id('tempdb.dbo.#A') is not null drop table #A go create table #A([id] int,[strs] varchar(7)) insert #A select 1,'a,b,c,d' union all select 2,'a,f,g' --------------开始查询--------------------------select ID,SUBSTRING(strs,NUMBER,CHARINDEX(',',strs+',',NUMBER)-NUMBER)AS strs from #A,MASTER..SPT_VALUES WHERE TYPE='P' AND SUBSTRING(','+strs,NUMBER,1)=',' ----------------结果---------------------------- /* (所影响的行数为 2 行)ID strs ----------- ------- 1 a 1 b 1 c 1 d 2 a 2 f 2 g(所影响的行数为 7 行) */
--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 */
id strs 1 a,b,c,d, 2 a,f,g, 如果这样呢?
---------------------------------------------------------------- -- Author :SQL77(只为思齐老) -- Date :2010-01-14 18:54:09 -- Version: -- Microsoft SQL Server 2000 - 8.00.194 (Intel X86) -- Aug 6 2000 00:57:48 -- Copyright (c) 1988-2000 Microsoft Corporation -- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3) -- ---------------------------------------------------------------- --> 测试数据:#A if object_id('tempdb.dbo.#A') is not null drop table #A go create table #A([id] int,[strs] varchar(10)) insert #A select 1,'a,b,c,d,' union all select 2,'a,f,g,' --------------开始查询--------------------------select ID, SUBSTRING(strs,NUMBER,CHARINDEX(',',strs+',',NUMBER)-NUMBER)AS strs from #A,MASTER..SPT_VALUES WHERE TYPE='P' AND SUBSTRING(','+LEFT(strs,LEN(strs)-1),NUMBER,1)=',' ----------------结果---------------------------- /* (所影响的行数为 2 行)ID strs ----------- ------- 1 a 1 b 1 c 1 d 2 a 2 f 2 g(所影响的行数为 7 行) */SUBSTRING(','+LEFT(strs,LEN(strs)-1),NUMBER,1)=','
每个id相关的都会多出一个空行,当然可以where的后面增加 and A.[values] is not null 过滤掉,但能不能CHARINDEX的时候就过滤掉SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b SELECT A.id, SUBSTRING(A.[values], B.id, CHARINDEX(',', A.[values] + ',', B.id) - B.id) FROM tb A, # B WHERE SUBSTRING(',' + A.[values], B.id, 1) = ',' 谢谢
http://blog.csdn.net/jinjazz/archive/2009/09/01/4507720.aspx
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 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)
SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b SELECT A.id, SUBSTRING(A.[values], B.id, CHARINDEX(',', A.[values] + ',', B.id) - B.id)
FROM tb A, # B
WHERE SUBSTRING(',' + A.[values], B.id, 1) = ',' DROP TABLE # 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
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 DROP TABLE tb /*
id value
----------- ------------------------------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
-- Author :SQL77(只为思齐老)
-- Date :2010-01-14 18:54:09
-- Version:
-- Microsoft SQL Server 2000 - 8.00.194 (Intel X86)
-- Aug 6 2000 00:57:48
-- Copyright (c) 1988-2000 Microsoft Corporation
-- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:#A
if object_id('tempdb.dbo.#A') is not null drop table #A
go
create table #A([id] int,[strs] varchar(7))
insert #A
select 1,'a,b,c,d' union all
select 2,'a,f,g'
--------------开始查询--------------------------select ID,SUBSTRING(strs,NUMBER,CHARINDEX(',',strs+',',NUMBER)-NUMBER)AS strs
from #A,MASTER..SPT_VALUES WHERE TYPE='P' AND SUBSTRING(','+strs,NUMBER,1)=','
----------------结果----------------------------
/* (所影响的行数为 2 行)ID strs
----------- -------
1 a
1 b
1 c
1 d
2 a
2 f
2 g(所影响的行数为 7 行)
*/
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
*/
id strs
1 a,b,c,d,
2 a,f,g,
如果这样呢?
-- Author :SQL77(只为思齐老)
-- Date :2010-01-14 18:54:09
-- Version:
-- Microsoft SQL Server 2000 - 8.00.194 (Intel X86)
-- Aug 6 2000 00:57:48
-- Copyright (c) 1988-2000 Microsoft Corporation
-- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:#A
if object_id('tempdb.dbo.#A') is not null drop table #A
go
create table #A([id] int,[strs] varchar(10))
insert #A
select 1,'a,b,c,d,' union all
select 2,'a,f,g,'
--------------开始查询--------------------------select
ID,
SUBSTRING(strs,NUMBER,CHARINDEX(',',strs+',',NUMBER)-NUMBER)AS strs from #A,MASTER..SPT_VALUES WHERE TYPE='P' AND SUBSTRING(','+LEFT(strs,LEN(strs)-1),NUMBER,1)=','
----------------结果----------------------------
/* (所影响的行数为 2 行)ID strs
----------- -------
1 a
1 b
1 c
1 d
2 a
2 f
2 g(所影响的行数为 7 行)
*/SUBSTRING(','+LEFT(strs,LEN(strs)-1),NUMBER,1)=','
FROM tb A, # B
WHERE SUBSTRING(',' + A.[values], B.id, 1) = ','
谢谢