Select query to combine two variable data

Question

Hi
I have following variable data
DECLARE @col1 VARCHAR(250)='A,B,C'
DECLARE @col2 VARCHAR(250)='A1,B1,C1'
I want to select data in following form like @col1,@col2 :
A,A1
B,B1
C,C1
Thanks

Answer 1

In fact i fear that this is not even on a table query but on a function or procedure, notice the word variable data ...
However, as we always want to learn something new here we go :-):
create table testdata (s1, varchar(250), s2  varchar(250))
insert into testdata values ('A,B,C','A1,B1,C1,D1')
with comb (s1,v1,s2,v2) as (
select
  cast(substring(s1,1,1) as varchar(251)), cast(substring(s1+',', charindex(',', s1)+1, len(s1) - charindex(',', s1) + 1) as varchar(251))
, cast(substring(s2,1,1) as varchar(251)), cast(substring(s2+',', charindex(',', s2)+1, len(s2) - charindex(',', s2) + 1) as varchar(251))
from testdata
union all
select
  cast(substring(v1, 1, case when charindex(',', v1) - 1 < 0 then 0 else charindex(',', v1) - 1 end) as varchar(251)), cast(substring(v1, charindex(',', v1) + 1, len(v1) - charindex(',', v1))  as varchar(251))
, cast(substring(v2, 1, case when charindex(',', v2) - 1 < 0 then 0 else charindex(',', v2) - 1 end) as varchar(251)), cast(substring(v2, charindex(',', v2) + 1, len(v2) - charindex(',', v2))  as varchar(251))
from comb
where
len(v1)>0 or len(v2)>0
select s1,s2 from comb
s1         s2
A          A
B          B1
C          C1
           D1That's no fun. Notice this cast mess.
Happy coding!