Re: Efficient date range search?

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... :(

>
> --
> Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
> "Porque francamente, si para saber manejarse a uno mismo hubiera que
> rendir examen... ¿Quién es el machito que tendría carnet?" (Mafalda)