Re: Efficient date range search?

From: Bruno Wolff III <bruno(at)wolff(dot)to>
To: Jean-Luc Lachance <jllachan(at)nsd(dot)ca>
Cc: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>, shridhar_daithankar(at)persistent(dot)co(dot)in, pgsql-general(at)postgresql(dot)org
Subject: Re: Efficient date range search?
Date: 2002-10-07 17:52:48
Message-ID: 20021007175248.GA29443@wolff.to
Views: Whole Thread | Raw Message | Download mbox | Resend email
Thread:
Lists: pgsql-general

On Mon, Oct 07, 2002 at 13:32:09 -0400,
Jean-Luc Lachance <jllachan(at)nsd(dot)ca> wrote:
> Alvaro Herrera wrote:
> >
> > On Mon, Oct 07, 2002 at 12:11:35PM -0400, Jean-Luc Lachance wrote:
> > > Shridhar Daithankar wrote:
> > > > Create an index on died field. And query like
> > > >
> > > > select * from pets where died < "last year july 4 7:01 PM;
> >
> > > If the pet is still alive today died would be NULL and the where clause
> > > would not be true.
> >
> > In that case check for NULL explicitly,
> >
> > select * from pets where died > [date] or died is null;
>
>
> Then you're back to whole table scan... :(

You could use 'infinity'::timestamp as a code for pets that are currently
alive instead of null.

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Jean-Luc Lachance 2002-10-07 18:59:37 Re: Efficient date range search?
Previous Message Neil Conway 2002-10-07 17:48:00 Re: [HACKERS] Hot Backup