
select lpad(rownum, 2, 0) ymd from dual connect by rownum <= (SELECT add_months(trunc(to_date('201002', 'yyyymm'), 'mm'), 1) - trunc(to_date('201002', 'yyyymm'), 'mm') FROM DUAL)
select lpad(rownum, 2, 0) ymd from dual connect by rownum <= (SELECT add_months(trunc(to_date('201002', 'yyyymm'), 'mm'), 1) - trunc(to_date('201002', 'yyyymm'), 'mm') FROM DUAL)