Query To Get The Number of Seconds or Minutes or Hours Between Two Given Dates

For the Seconds:-
-------------------
SELECT ('Your first Date'-'Your another Date') * DECODE( UPPER('SS')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

Example:-
SELECT (SYSDATE+1-SYSDATE) * DECODE( UPPER('SS')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

For Minutes:-
---------------
SELECT ('Your first Date'-'Your another Date') * DECODE( UPPER('MI')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

Example:-
SELECT (SYSDATE+1-SYSDATE) * DECODE( UPPER('MI')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

For the Hours:-
-----------------
SELECT ('Your first Date'-'Your another Date') * DECODE( UPPER('HH')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

Example:-
SELECT (SYSDATE+1-SYSDATE) * DECODE( UPPER('HH')
, 'SS', 24*60*60
, 'MI', 24*60
, 'HH', 24, NULL )
FROM DUAL;

Thanks
Amar Alam