From: lists-pgsql@useunix.net
To: pgsql-sql@postgresql.org
Subject: Re: selecting records X minutes apart
Date: Sat, 4 Jun 2011 14:58:47 -0400
Message-ID: <20110604185847.GF1324@slacker.ja10629.home> (raw)
In-Reply-To: <BANLkTi=9aNjR3vTBAPgEyuF0kFU24PjEng@mail.gmail.com>
References: <20110603195253.GE1324@slacker.ja10629.home>
<BANLkTi=9aNjR3vTBAPgEyuF0kFU24PjEng@mail.gmail.com>
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@useunix.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
> >
> > --
> > Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> > To make changes to your subscription:
> > http://www.postgresql.org/mailpref/pgsql-sql
> >
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To: pgsql-sql@postgresql.org
Cc: lists-pgsql@useunix.net
Subject: Re: selecting records X minutes apart
In-Reply-To: <20110604185847.GF1324@slacker.ja10629.home>
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