Re: Determine the time difference from records in a select

Robert:

> I have a firewall hit database which keeps the date of the hit and
> the
> offenders IP (among other items). I would like to be able to execute
> a
> select which would show each unique IP and the time difference from
> the
> latest hit to the first hit. I can do this in scripts, but was
> wondering if
> there is a pure SQL query/queries way to accomplish this.

You need to use a subselect, which means you need to be running 7.1 or
better. Here's the basic idea:

SELECT agg_last.ip_address, first_hit, last_hit, (last_hit - first_hit)
AS hit_interval FROM
(SELECT ip_address, min(hit_date) as first_hit

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