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 |
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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.
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