Using lag and rank in the same query

Hi
I am trying to find out the difference in time between peoples memberships and also the order that these memberships are taken out in. So far I have added in a rank statement to work out the order the memberships were created in, but now want to look at the difference between the dates returned. The SQL I used is:
SELECT owner_party_id,
mem_number,
support_id,
mem_start_date,
RANK() OVER (PARTITION BY owner_party_id ORDER BY mem_start_date ASC) MEMBERSHIP_SEQUENCE
FROM membership_all
WHERE version_type = 'CUR'
AND owner_party_id IN ('65051', '65051', '65348', '65348', '65607', '65607', '65607')
to get:
"OWNER_PARTY_ID"|"MEM_NUMBER"|"SUPPORT_ID"|"MEM_START_DATE"|"MEMBERSHIP_SEQUENCE"
65051|318874751|8014747|01-MAR-10|1
65051|412311060|21502883|15-AUG-12|2
65348|308672459|3526913|01-MAY-10|1
65348|409951130|20950524|18-JUN-12|2
65607|315830192|7510133|17-MAY-10|1
65607|406448110|20024246|16-MAR-12|2
65607|409738130|20903556|14-JUN-12|3
Now I would like to calculate the difference between the start dates of each of the owner_party_id groups, so to get something like this:
OWNER_PARTY_ID|MEM_NUMBER     |SUPPORT_ID|MEM_START_DATE     |MEMBERSHIP_SEQUENCE|Diff
65051|318874751|8014747|01-Mar-10|1|
65051|412311060|21502883|15-Aug-12|2|898
65348|308672459|3526913|01-May-10|1
65348|409951130|20950524|18-Jun-12|2|779
65607|315830192|7510133|17-May-10|1
65607|406448110|20024246|16-Mar-12|2|669
65607|409738130|20903556|14-Jun-12|3|90
I think that I need to use the Lag function in, but I am not too sure if it can be linkited to look at the data within a grouping of owner party id, as it would make no sense to calculate the difference in dates for two different owner party ids.
Any advice much appreciated.
Thanks
Edited by: 992871 on 09-Mar-2013 23:34

Couple notes:
1. You wrote you want to get order that these memberships are taken out in, however, both your and Etbin's queries calculate order within each owner_party_id and not across all members. If you want to get rank and difference in time regardless of member's owner_party_id remove PARTITION BY caluse.
2. You might want to use DENSE_RANK and not RANK depending how you want to display rank. If two people joined at the same time and were second in rank, analytic RANK will be:
RANK
1
2
2
4
5
.while DENSE_RANK:
DENSE_RANK
1
2
2
3
4
.SY.

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