Computing average for the time

Question

Can any one to help to get the average for the time
For example
create table time_avg (time date);
insert into time_avg (select trunc(sysdate,'hh')+5/24/60 from dual);
insert into time_avg (select trunc(sysdate,'hh')+10/24/60 from dual);
insert into time_avg (select trunc(sysdate,'hh')+15/24/60 from dual);
insert into time_avg (select trunc(sysdate,'hh')+20/24/60 from dual);
select to_char(time,'hh24miss') from time_avg;
TO_CHA
140500
141000
141500
142000
I want to get the average for the above .

Answer 1

SQL> INSERT INTO time_avg
  2  SELECT SYSDATE-ROWNUM-1-(rownum/24)
  3  FROM all_objects
  4  WHERE rownum<=10;
10 rows created.
SQL> ALTER SESSION SET NLS_DATE_FORMAT='DD-mon-YYYY HH24:MI:SS';
Session altered.
SQL> select * from time_avg;
TIME
10-may-2006 11:10:22
09-may-2006 10:10:22
08-may-2006 09:10:22
07-may-2006 08:10:22
06-may-2006 07:10:22
05-may-2006 06:10:22
04-may-2006 05:10:22
03-may-2006 04:10:22
02-may-2006 03:10:22
01-may-2006 02:10:22
10 rows selected.
SQL> SELECT to_char(trunc(sysdate)+(avg(to_number(to_char(time,'sssss'))))/86400,'hh24:mi:ss')
  2  FROM time_avg
  3  /
TO_CHAR(
06:40:22---------------
Anwar