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datediff in Oracle

WITH T as (
  SELECT 
    starttime,
    endtime,
    TO_TIMESTAMP(
      TO_CHAR(endtime, 'dd-mon-yyyy hh24:mi:ss'),
      'dd-mon-yyyy hh24:mi:ss') - starttime as d
    FROM xx
    WHERE create_date > to_date(12-Dec-2012', 'dd-mon-yyyy')
    ORDER BY create_date DESC
)
SELECT
  starttime as "Start Time",
  endtime as "End Time",
  EXTRACT (DAY FROM d)*24*60*60+
  EXTRACT (HOUR FROM d)*60*60+
  EXTRACT (MINUTE FROM d)*60+
  EXTRACT (SECOND FROM d) as "Duration in Second",
  (EXTRACT (DAY FROM d)*24*60*60+
   EXTRACT (HOUR FROM d)*60*60+
   EXTRACT (MINUTE FROM d)*60+
   EXTRACT (SECOND FROM d)
  )/60 as "Duration in Minute"
FROM T;

 

WITH TT AS (
  select 'A' as emp, '|' as lft, '|2' as rgt from dual
  union 
  select 'B' as emp, '2' as lft, '3' as rgt from dual
  union
  select 'C' as emp, '4' as lft, '||' as rgt from dual
  union
  select 'D' as emp, '5' as lft, '6' as rgt from dual
  union 
  select 'E' as emp, '7' as lft, '8' as rgt from dual
  union 
  select 'F' as emp, '9' as lft, '|0' as rgt from dual
)
 SELECT P2.* FROM TT P2, TT P1 WHERE P1.lft BETWEEN P2.lft AND P2.rgt AND P1.emp = 'C';