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Date: Fri, 19 Dec 2003 11:12:24 -0500
From: Wei Weng <wweng@kencast.com>
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To: Geoffrey <esoteric@3times25.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: testing for null value in integer field?
References: <3FE32231.5030207@3times25.net>
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Geoffrey wrote:

> How does one check for an unset value in an integer field?
>
> I've tried such things as:
>
> select ..... where intnumber = ''
> select ...... where intnumber =  ?
> select .....  where intnumber = NULL
>
> Thanks.
>
It is actually WHERE intnumber IS NULL. You don't use operator = to 
compare with NULLs, you use IS.

HTH.

Wei