declare @col varchar(1000) set @col='张三,李四,王五,赵六' select substring(@col,number,charindex(',',@col+',',number+1)-number) from master..spt_values where type='p' and number<=len(@col) and substring(@col,number,1)<>',' and substring(','+@col,number,1)=',' /*---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 张三 李四 王五 赵六(4 行受影响) */
--拆分表中的列值 create table tb(userid int,col varchar(20)) insert into tb select 1,'张三,李四,王五,曹六' insert into tb select 2,'陈七,刘八,赵九,杨十' go select a.userid,substring(a.col,b.number,charindex(',',a.col+',',b.number+1)-b.number)col from tb a,master..spt_values b where b.type='p' and b.number<=len(a.col) and substring(a.col,b.number,1)<>',' and substring(','+a.col,b.number,1)=',' /* userid col ----------- -------------------- 1 张三 1 李四 1 王五 1 曹六 2 陈七 2 刘八 2 赵九 2 杨十(8 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 */
--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)=',' 大版的还有一种方法 呵呵
有xml来处理。use tempdb go create table tb_test (id int,val varchar(50)); insert into dbo.tb_test values(1,'张三,李四,王五,赵六'); go declare @val xml; select @val='<x>'+REPLACE(val,',','</x><x>')+'</x>' from dbo.tb_test select tb.c.query('data(.)') from @val.nodes('/x') as tb(c) go drop table tb_test go------------------------ 张三 李四 王五 赵六(4 row(s) affected)
你也可以用函数: /* 功能:实现split功能的函数 */create function dbo.fn_split ( @inputstr varchar(8000), @seprator varchar(10) ) returns @temp table (a varchar(200)) as begin declare @i intset @inputstr = rtrim(ltrim(@inputstr)) set @i = charindex(@seprator, @inputstr)while @i >= 1 begin insert @temp values(left(@inputstr, @i - 1))set @inputstr = substring(@inputstr, @i + 1, len(@inputstr) - @i) set @i = charindex(@seprator, @inputstr) endif @inputstr <> '\' insert @temp values(@inputstr)return end go--调用declare @s varchar(1000)set @s='1,2,3,4,5,6,7,8,55'select * from dbo.fn_split(@s,',')drop function dbo.fn_split /* a ---------------------- 1 2 3 4 5 6 7 8 55(所影响的行数为 9 行) */
或者参考我整理的资料: /* 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) */
set @col='张三,李四,王五,赵六'
select substring(@col,number,charindex(',',@col+',',number+1)-number) from master..spt_values
where type='p' and number<=len(@col) and substring(@col,number,1)<>',' and substring(','+@col,number,1)=','
/*----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
张三
李四
王五
赵六(4 行受影响)
*/
create table tb(userid int,col varchar(20))
insert into tb select 1,'张三,李四,王五,曹六'
insert into tb select 2,'陈七,刘八,赵九,杨十'
go
select a.userid,substring(a.col,b.number,charindex(',',a.col+',',b.number+1)-b.number)col
from tb a,master..spt_values b
where b.type='p' and b.number<=len(a.col) and substring(a.col,b.number,1)<>',' and substring(','+a.col,b.number,1)=','
/*
userid col
----------- --------------------
1 张三
1 李四
1 王五
1 曹六
2 陈七
2 刘八
2 赵九
2 杨十(8 行受影响)*/
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
*/
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)=','
大版的还有一种方法 呵呵
go
create table tb_test (id int,val varchar(50));
insert into dbo.tb_test values(1,'张三,李四,王五,赵六');
go
declare @val xml;
select @val='<x>'+REPLACE(val,',','</x><x>')+'</x>'
from dbo.tb_test
select tb.c.query('data(.)')
from @val.nodes('/x') as tb(c)
go
drop table tb_test
go------------------------
张三
李四
王五
赵六(4 row(s) affected)
怎么学习用xml的方式呢
关于xquery不会
查看有注释一段
/*
功能:实现split功能的函数
*/create function dbo.fn_split
(
@inputstr varchar(8000),
@seprator varchar(10)
)
returns @temp table (a varchar(200))
as begin
declare @i intset @inputstr = rtrim(ltrim(@inputstr))
set @i = charindex(@seprator, @inputstr)while @i >= 1
begin
insert @temp values(left(@inputstr, @i - 1))set @inputstr = substring(@inputstr, @i + 1, len(@inputstr) - @i)
set @i = charindex(@seprator, @inputstr)
endif @inputstr <> '\'
insert @temp values(@inputstr)return
end
go--调用declare @s varchar(1000)set @s='1,2,3,4,5,6,7,8,55'select * from dbo.fn_split(@s,',')drop function dbo.fn_split /*
a
----------------------
1
2
3
4
5
6
7
8
55(所影响的行数为 9 行)
*/
/*
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)
*/