Re: selecting records X minutes apart

On Sat, Jun 04, 2011 at 11:45:08AM +0000, Jasen Betts wrote:
> On 2011-06-03, lists-pgsql(at)useunix(dot)net <lists-pgsql(at)useunix(dot)net> wrote:
> >
> > ID TS (HH:MM)
> > -------------------
> > 0 20:00
> > 0 20:05
> > 0 20:10
> > 1 20:03
> > 1 20:09
> >
> >
> > Does my question make sense?
>
> no, why is (1,20:04) excluded, but (0,20:05) included?
> both records are 5 minutes from the newest.

Jasen,

(1,20:04) is excluded because it's timestamp is less than 5 minutes from the
previous record with the same ID (1,20:03), (0,20:05) is included for the
opposite reason.

Let me restate my requirement again with a little more detail. I want to
select records grouped by ID, ordered by timestamp, in ascending order so I'm
starting with the oldest, that are at least X minutes apart.

I hope that helps.

Thanks again,
Wayne