Re: Grouping logs by ip and time

On 08/11/2011 18:48, Raymond O'Donnell wrote:
> On 08/11/2011 17:59, Alex Thurlow wrote:
>> Hello all,
>>     I have a table which stores action logs from users.  It looks
>> something like this:
>> log_type text,
>> date date,
>> "time" time without time zone,
>> ip inet
>
> [snip]
>
>> What I'd like to do is be able to group these logs by sessions based on
>> the IP and the time range so I can figure out the time taken between
>> each action.
>
> Would something like this work? -
>
>   select ip, max("time") - min("time") as session_duration
>   from log_table
>   group by ip;
>
> This doesn't take the date into account - what happens if the session
> spans midnight? You can get around this by using a timestamp column
> instead of separate date and time.

Whoops - just re-read your email, and realised that you're looking for
the time between actions; the above just gives you the total duration of
the session from each IP address.

Ray.


--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie