DROP PROCEDURE LoopDemo;

create procedure LoopDemo()
  BEGIN
    DECLARE x INT;
    DECLARE str VARCHAR(255);
    DECLARE tmp_pubb_dal VARCHAR(255);

    SET x = 2490;
    SET str =  '';

    loop_label:  LOOP
      IF  x > 2501 THEN
        LEAVE  loop_label;
      END  IF;

      SET  x = x + 1;
      SELECT pubb_dal into tmp_pubb_dal from N_DETERMINE where numero = `x` and data like '%2019' limit 1;

      SET  str = CONCAT(str,tmp_pubb_dal,',');
    END LOOP;

    SELECT str;

  END;