DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=mime-version:in-reply-to:references:date:message-id:subject:from:to
	:cc:content-type;
	b=lOoLD9mboKerIYDRMkN6OWFhVj9OONoP/yFdrMIpqKjAoGTKwW9m7M+ilmmr+c6i1c
	DWcHfWnEPaR3D81KmOiIIQXna5e+0/og7GLV6A6TlFls2gspVH9PoMnQLnSQlePL48AK
	5Tn/0t7IWeWdX6X9OuH2nZKirSpFiepS/BIuk=
MIME-Version: 1.0
In-Reply-To: <201105100948.41392.johnf@jfcomputer.com>
References: <201105100948.41392.johnf@jfcomputer.com>
Date: Tue, 10 May 2011 10:16:21 -0700
Message-ID: <BANLkTina8jK3f_p0xynxgzQhpL2aCUsL6A@mail.gmail.com>
Subject: Re: Dates and NULL's`
From: Richard Broersma <richard.broersma@gmail.com>
To: John Fabiani <johnf@jfcomputer.com>
Cc: pgsql-sql@postgresql.org
Content-Type: text/plain; charset=ISO-8859-1

On Tue, May 10, 2011 at 9:48 AM, John Fabiani <johnf@jfcomputer.com> wrote:

> Where mydate >= "2011/04/01"::date and mydate<= "2011/04/30"::date
> With the above where will the NULL's be selected????


Here is what I get when I try:

spi=> SELECT NULL::DATE >= '2011-04-01'::DATE AND NULL::DATE <=
'2011-04-30'::DATE;
 ?column?
----------

(1 row)


spi=> SELECT (NULL::DATE >= '2011-04-01'::DATE AND NULL::DATE <=
'2011-04-30'::DATE) IS TRUE;
 ?column?
----------
 f
(1 row)


spi=> SELECT (NULL::DATE >= '2011-04-01'::DATE AND NULL::DATE <=
'2011-04-30'::DATE) IS FALSE;
 ?column?
----------
 f
(1 row)


spi=> SELECT (NULL::DATE >= '2011-04-01'::DATE AND NULL::DATE <=
'2011-04-30'::DATE) IS UNKNOWN;
 ?column?
----------
 t
(1 row)


-- 
Regards,
Richard Broersma Jr.