將逗號分隔的字段拆解成記錄

將

1, '1,2' , 'a,b'
2 , '1,3' , 'a,c,d'

拆成

1,1,a

1,1,b

1,2,a

1,2,b

2,1,a

2,1,c

2,1,d

2,3,a

2,3,c

2,3,d

IF OBJECT_ID('tb') IS NOT NULL

DROP TABLE tb

GO

CREATE TABLE tb( id int, code varchar(10),code2 varchar(10))

go

insert tb SELECT 



1, '1,2' , 'a,b' UNION ALL SELECT 

2 , '1,3' , 'a,c,d' 

go

select a.id,code,code2=substring(a.code2,b.number,charindex(',',a.code2+',',b.number)-b.number) 

from (

Select

a.id,code=substring(a.code,b.number,charindex(',',a.code+',',b.number)-b.number) ,code2

from 

Tb a join master..spt_values b 

ON B.type='p' AND B.number BETWEEN 1 AND LEN(A.code)

where

substring(','+a.code,b.number,1)=',') a join master..spt_values b 

ON B.type='p' AND B.number BETWEEN 1 AND LEN(A.code2)

where

substring(','+a.code2,b.number,1)=','



go