How to get the number of minutes or hours from date arithmetic ?

Thanks in advance,
I have two date fields that I would like to derive the number of minutes or hours via the following:
select start_date - end_date from dual;
How do I get HH:MM results ? Thanks

If greater than 24 hours you'll need to calculate the hours and minutes as numbers individually. (You can then display them in whatever format you choose)
SQL> ed
Wrote file afiedt.buf
1 with t as (select to_date('6-10-2008 08:00','DD-MM-YYYY HH24:MI') as from_dt, to_date('7-10-2008 12:30','DD-MM-YYYY HH24:MI') as to_dt from dual)
2 --
3 select from_dt, to_dt, to_dt-from_dt
4        ,to_char(trunc(sysdate)+(to_dt-from_dt),'HH24:MI') as hrs_mins
5        ,trunc((to_dt-from_dt)*24) as hrs
6        ,trunc((((to_dt-from_dt)*24)-trunc((to_dt-from_dt)*24))*60) as mins
7* from t
SQL> /
FROM_DT           TO_DT             TO_DT-FROM_DT HRS_M        HRS       MINS
06-OCT-2008 08:00 07-OCT-2008 12:30        1.1875 04:30         28         30
SQL>

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