Re: Dates and NULL's`

On Tuesday, May 10, 2011 10:16:21 am Richard Broersma wrote:
> 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)
Sorry Richard, I do not understand.  

It looks like you are saying the NULLS will be returned too 

Johnf