From: lists-pgsql@useunix.net
To: pgsql-sql@postgresql.org
Subject: Re: selecting records X minutes apart
Date: Sat, 4 Jun 2011 15:15:59 -0400
Message-ID: <20110604191559.GA16254@slacker.ja10629.home> (raw)
In-Reply-To: <isd5s4$86l$1@reversiblemaps.ath.cx>
References: <20110603195253.GE1324@slacker.ja10629.home>
<isd5s4$86l$1@reversiblemaps.ath.cx>
On Sat, Jun 04, 2011 at 11:45:08AM +0000, Jasen Betts wrote:
> On 2011-06-03, lists-pgsql@useunix.net <lists-pgsql@useunix.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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: lists-pgsql@useunix.net
Subject: Re: selecting records X minutes apart
In-Reply-To: <20110604191559.GA16254@slacker.ja10629.home>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox