Difrence Entre Deux Fechas SQL Oracle

 SQL> select 24 * (to_date('2009-07-07 22:00', 'YYYY-MM-DD hh24:mi') - to_date('2009-07-07 19:30', 'YYYY-MM-DD hh24:mi')) diff_hours from dual; DIFF_HOURS ---------- 2.5
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