How to get two date difference in Day/hour/min/secs pl

First of all,
Hello to All, i am new to Oracle DB, but i have little experience in Other Database such as Sybase, sql server etc
please kindly help me
in DoctorChart table i have DocName,Id#,Citcotype,Medtype,AdmitDate,DischargeDate(both admitdate & Discharge date is date formatted columns)
so how can i get the below differenceTime (which means Dischargedate-Admit Date in below format i.e, Day,Hours,Minutes,Seconds...)
DoctorName, ID #, Citco type, MEDtype, DifferenceTime
========= === ======= ======= ===========
Dr. KindaEmesko, 20045, Replace OutCard, ICH, 0 day 9 hours 11 minutes
Dr. KindaEmesko, 20098, Replace OutCard, ICH, 1 day 2 hours 34 minutes
Dr. KindaEmesko, 20678, Replace OutCard, ICH, 2 day 23 hours 52 minutes
Dr. KindaEmesko, 20212, Replace OutCard, ICH, 4 day 1 hours 00 minutes
Dr. KindaEmesko, 20345, Replace OutCard, BED, 3 days 14 hours 15 minutes
Dr. KindaEmesko, 20678, Replace OutCard, BED, 9 days 21 hours 52 minutes
Dr. KindaEmesko, 20015, Signature Overlay, Rest, 0 days 3 hours 29 minutes
Dr. KindaEmesko, 45678, Signature Overlay, Rest, 0 days 1 hours 29 minutes
Same way how can i get the Average Time for the above result (without ID columns)
DoctorName, Citco type, MEDtype, Avg DifferenceTime
========= === ======= ======= ===========
Dr. KindaEmesko, Replace OutCard, ICH, 2 day 1 hours 00 minutes
Dr. KindaEmesko, Replace OutCard, BED, 6 days 17 hours 15 minutes
Dr. KindaEmesko, Signature Overlay, Rest, 0 days 2 hours 29 minutes
Please just tell me how to get the two dates difference as day/hour/minute format
as well as how to get avg ( two dates difference as day/hour/minute format)
Please Help me
Thanks in advance

Well, instead of all these suggested manipulations you can simply use intervals. Oracle uses day as a unit in date arithmetic, so Dischargedate-Admit Date is number od days between two dates. Built-in function numtodsinterval can be used to convert it into interval. For example:
SQL> with t as (
2             select trunc(sysdate) - 2 Admit_Date,
3                    sysdate            Discharge_Date
4               from dual
5            )
6 select numtodsinterval(Discharge_Date - Admit_Date,'DAY') Hospital_Stay
7    from t
8 /
HOSPITAL_STAY
+000000002 00:01:08.000000000
SQL> SY.

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