Re: selecting records X minutes apart

The TS column type is actually a timestamp with out timezone and yes I want to
take seconds into account so both of your entries would be included in the
result.

On Fri, Jun 03, 2011 at 06:01:53PM -0700, Kevin Crain wrote:
> Will you be using a full timestamp with that or are you only concerned
> about hours and minutes? If you want a full timestamp do you care
> about the seconds? For example, do you want to be able to do this for
> '2011-06-01 23:59:04' and '2011-06-02 00:04:04'?
>
> On Fri, Jun 3, 2011 at 12:52 PM, <lists-pgsql(at)useunix(dot)net> wrote:
> > I have a table that, at a minimum, has ID and timestamp columns.  Records
> > are inserted into with random IDs and timestamps.  Duplicate IDs are allowed.
> >
> > I want to select records grouped by ID, ordered by timestamp that are X minutes
> > apart. In this case X is 5.
> >
> > Note, the intervals are not X minute wall clock intervals, they are X minute
> > intervals from the last accepted record, per-id.
> >
> > For instance here is some sample input data:
> >
> > ID      TS (HH:MM)
> > -------------------
> > 0       20:00
> > 1       20:03
> > 1       20:04
> > 0       20:05
> > 1       20:05
> > 0       20:08
> > 1       20:09
> > 0       20:10
> >
> > I'd want the select to return:
> >
> > ID      TS (HH:MM)
> > -------------------
> > 0       20:00
> > 0       20:05
> > 0       20:10
> > 1       20:03
> > 1       20:09
> >
> >
> > Does my question make sense?
> >
> > Thanks in advance,
> > Wayne
> >
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