subquery or leftjoin with group by which one is faster?

Question

i have to show running total with the total column in my application ... so i have used the fol

Answer 1

I think you will find the recursive CTE a bit faster.

;with C as
(
  select t.ind,
         t.col1,
         t.col1 as Total
  from @tmp as t
  where t.ind = 1
  union all
  select t.ind,
         t.col1,
         C.Total + t.col1 as Total
  from @tmp as t
    inner join C
      on C.ind + 1 = t.ind
)
select C.col1,
       C.Total
from C

any other method by which is more faster

Yes there is. If you are looking for outstanding performance you should just pull your data in a simple select and do the running total calculation on the client when you do the presentation.