Create auto counter 1,2,3,4,5...etc

Question

I need to insert new first column counter

1

2

3

4

5

6..etc in this code

String saveStaff = " Select  roba as 'Naziv artikla', SUM (cast(kolicina as float)) as 'Kolicina' from (select roba, kolicina from mp_racun_roba union all select roba, kolicina from mp_faktura_roba) as alltables group by roba";

 Some recomandition?