Would something like this work? -
select ip, max("time") - min("time") as session_duration
from log_table
group by ip;
I don't think this is the right way to do. This is based on ip address,
so if
- client connect diffrent times with same ip
- client has sime ip but he made another action on other day.
you will have a wrong results.
You should save also the session id and group by sesion id not ip.
Ex. :
Table
------------------
log_type text,
date date,
"time" time without time zone,
ip inet session_id text -- you can use maybe foreign tables ?
SQL ( Same as Raynold's but groups session ids)
-------------------
select ip, max("time") - min("time") as session_duration
from log_table
group by session_id;
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