分割字符串，转换成列表数据

ALTER function [dbo].[f_split](@c nvarchar(2000),@split nvarchar(2))
returns @t table(col nvarchar(50))
as
begin
while(charindex(@split,@c)<>0)
begin
insert @t(col) values (substring(@c,1,charindex(@split,@c)-1))
set @c = stuff(@c,1,charindex(@split,@c),'')
end
insert @t(col) values (@c)
return
end