Re: Efficient date range search?

From: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>
To: Jean-Luc Lachance <jllachan(at)nsd(dot)ca>
Cc: shridhar_daithankar(at)persistent(dot)co(dot)in, pgsql-general(at)postgresql(dot)org
Subject: Re: Efficient date range search?
Date: 2002-10-07 16:20:37
Message-ID: 20021007162037.GF2521@dcc.uchile.cl
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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;

--
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)

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