字符串分段拆分截取

if object_id('ta') is not null drop table ta
go
create table ta( col varchar(100))
insert ta select
'aa/bb/cc/dd/ee/ff' union all select
'aaa/bbb/ccc/ddd/eee/ff/ggg'

go

if object_id('F_split') is not null drop function F_split
go
--加一个分隔函数:
create function F_split(
@s varchar(8000), --包含多个数据项的字符串
@pos int, --要获取的数据项的位置
@split varchar(10) --数据分隔符
)RETURNS varchar(100)
AS
BEGIN
IF @s IS NULL RETURN(NULL)
DECLARE @splitlen int --分隔符长度
SELECT @splitlen=LEN(@split+'a')-2
WHILE @pos>1 AND charindex(@split,@s+@split)>0
SELECT @pos=@pos-1,
@s=stuff(@s,1,charindex(@split,@s+@split)+@splitlen,'')
RETURN(nullif(left(@s,charindex(@split,@s+@split)-1),''))
END
GO

select dbo.F_split(col,1,'/'),dbo.F_split(col,3,'/'),dbo.F_split(col,5,'/')
from ta

drop table ta
drop function F_split
/*
aaccee
aaaccceee
*/