From: Emi Lu <emilu@encs.concordia.ca>
To: John Fabiani <johnf@jfcomputer.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Dates and NULL's`
Date: Tue, 10 May 2011 16:16:34 -0400
Message-ID: <4DC99D22.5000004@encs.concordia.ca> (raw)
In-Reply-To: <201105100948.41392.johnf@jfcomputer.com>
References: <201105100948.41392.johnf@jfcomputer.com>
> if I have a date field that contains a NULL
> will it show up when I ask for a where date range for the same date field.
>
> Where mydate>= "2011/04/01"::date and mydate<= "2011/04/30"::date
>
> With the above where will the NULL's be selected????
>
> I ask because I was always told that a NULL matches everything and nothing!
I think the answer is no.
when mydate is null, record will not be returned.
e.g.,
select 'abc' where (null::date >='2011-01-01'::date) ;
0 rows returned.
Emi
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To: pgsql-sql@postgresql.org
Cc: emilu@encs.concordia.ca, johnf@jfcomputer.com
Subject: Re: Dates and NULL's`
In-Reply-To: <4DC99D22.5000004@encs.concordia.ca>
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