assistance on self join pls

Hi all,

I have the following firewall connection data.

datetime | protocol | port | inside_ip | outside_ip
| outbound_count | outbound_bytes
---------------------+----------+-------+----------------+--------------
--+----------------+---------------
2004-05-05 05:00:00 | 6 | 21 | 192.168.11.191 |
205.227.137.53 | 6 | 3881
2004-05-05 05:00:00 | 6 | 22326 | 192.168.11.191 |
205.227.137.53 | 1 | 2592
2004-05-05 05:00:00 | 6 | 38005 | 192.168.11.191 |
205.227.137.53 | 1 | 51286
2004-05-05 05:00:00 | 6 | 51861 | 192.168.11.191 |
205.227.137.53 | 1 | 42460
2004-05-05 05:00:00 | 6 | 52095 | 192.168.11.191 |
205.227.137.53 | 1 | 2558
2004-05-05 05:00:00 | 6 | 59846 | 192.168.11.191 |
205.227.137.53 | 1 | 118
2004-05-05 05:00:00 | 6 | 60243 | 192.168.11.191 |
205.227.137.53 | 1 | 2092
2004-05-05 06:00:00 | 6 | 21 | 192.168.11.185 |
205.227.137.53 | 6 | 3814
2004-05-05 06:00:00 | 6 | 29799 | 192.168.11.185 |
205.227.137.53 | 1 | 118
2004-05-05 06:00:00 | 6 | 30138 | 192.168.11.185 |
205.227.137.53 | 1 | 2092
2004-05-05 06:00:00 | 6 | 30215 | 192.168.11.185 |
205.227.137.53 | 1 | 42460
2004-05-05 06:00:00 | 6 | 51279 | 192.168.11.185 |
205.227.137.53 | 1 | 1332
2004-05-05 06:00:00 | 6 | 52243 | 192.168.11.185 |
205.227.137.53 | 1 | 51286
2004-05-05 06:00:00 | 6 | 60079 | 192.168.11.185 |
205.227.137.53 | 1 | 2558

I am wanting to aggregate / collapse each entry to something similar to:

datetime | protocol | port | inside_ip | outside_ip
| outbound_count | outbound_bytes
---------------------+----------+-------+----------------+--------------
--+----------------+---------------
2004-05-05 05:00:00 | 6 | 21 | 192.168.11.191 |
205.227.137.53 | 12 | 104987
2004-05-05 06:00:00 | 6 | 21 | 192.168.11.185 |
205.227.137.53 | 12 | 103660

I have not had much success - any assistance greatly appreciated

Darren