Oracle SQL - Average Time Between Dates By Subject -

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i'm working in oracle sql. have table ids , dates, , i'm trying find average time between dates subject. this.

table 

subjectid     date       1        8/01/2013 12:00:00       1        8/31/2013 12:00:00     1        9/10/2013 12:00:00     2        1/01/2010 12:00:00       2        1/21/2010 12:00:00

i need write query goes through table subjectid, records time between dates, , outputs average of averages, speak. in example, time between first , second rows (30 days) + time between second , third rows (10 days) / 2 (to average subject 1, = 20), , time between rows 4 , 5 (20 days) / 1 (to average subject 2), , output should average between (20 + 10) / 2 = 15.

the average difference between min , max values, divided 1 less count.

for data:

select subjectid,        (case when count(*) > 1              (max(date) - min(date))/(count(*) - 1)         end) avgdifference t group subjectid;

to overall average, use subquery:

select avg(avgdifference) (select subjectid,              (case when count(*) > 1                    (max(date) - min(date))/(count(*) - 1)               end) avgdifference       t       group subjectid      ) t

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