Oracle計算時間SQL

SELECT EXTRACT(DAY
               FROM(TO_DATE('20130210000000', 'YYYYMMDDHH24MISS') - SYSDATE)
               DAY(9) TO SECOND) 天,
       EXTRACT(HOUR
               FROM(TO_DATE('20130210000000', 'YYYYMMDDHH24MISS') - SYSDATE)
               DAY(9) TO SECOND) 時,
       EXTRACT(MINUTE
               FROM(TO_DATE('20130210000000', 'YYYYMMDDHH24MISS') - SYSDATE)
               DAY(9) TO SECOND) 分鐘,
       EXTRACT(SECOND
               FROM(TO_DATE('20130210000000', 'YYYYMMDDHH24MISS') - SYSDATE)
               DAY(9) TO SECOND) 秒
  FROM DUAL