SQL将⼀个字段内⽤逗号分隔的内容分成多条记录
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由于业务需求，我们可能会把⼀串以分割符字符串数据放到⼀个字段，如我们在客户端处理拆分是很简单的，不过这样做效果不太好，怎么⽤SQL SERVER 2008 来解决这件事件哪？
--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
select1,N'a,b,c' union all
select2,N'd,e' union all
select3,N'f'
Go
sqlserver2008怎么下载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)=','
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 des('/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
*/

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