Oracle paging query SQL statement

1. No sorting

SELECT *
 FROM (Select ROWNUM AS ROWNO, T.*
      from k_task T
     where Flight_date between to_date('20060501', 'yyyymmdd') and
        to_date('20060731', 'yyyymmdd')
      AND ROWNUM <= 20) TABLE_ALIAS
WHERE TABLE_ALIAS.ROWNO >= 10;

 2. Sorted

SELECT *
 FROM (SELECT TT.*, ROWNUM AS ROWNO
      FROM (Select t.*
          from k_task T
          where flight_date between to_date('20060501', 'yyyymmdd') and
             to_date('20060531', 'yyyymmdd')
          ORDER BY FACT_UP_TIME, flight_no) TT
     WHERE ROWNUM <= 20) TABLE_ALIAS
where TABLE_ALIAS.rowno >= 10;