From: Dan Weeks <danimal@wildbrain.com>
To: Rod Taylor <rbt@rbt.ca>
Cc: pgsql-sql@postgresql.org
Subject: Re: silly NULL question
Date: Thu, 24 Jul 2003 16:31:13 -0700
Message-ID: <16160.27713.892311.733277@underdog.wildbrain.com> (raw)
In-Reply-To: <1059089115.90090.8.camel@jester>
References: <16160.26749.931319.656882@underdog.wildbrain.com>
<1059089115.90090.8.camel@jester>
>>>>> "RT" == "Rod Taylor" <rbt@rbt.ca>:
RT> NULL is similar to UNKNOWN.
RT>
RT> So, NULL = NULL is the similar to UNKNOWN = UNKNOWN. Since you don't
RT> know it, how can you tell if they're equal or not?
RT>
RT> Syntax you're looking for is: AND parent_id IS NULL
ah, of course. Thanks Rod.
RT> If you really really really need = NULL (due to some MS product which
RT> ignores SQL standards -- say MS Access) there is a toggle in the
RT> postgresql.conf file to allow automated conversion of = NULL to IS NULL
RT> within the server.
ah ha! the culprit. I see this was default through 7.1. Thanks again for
accurate and quick reply.
-dan
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To: pgsql-sql@postgresql.org
Cc: danimal@wildbrain.com, rbt@rbt.ca
Subject: Re: silly NULL question
In-Reply-To: <16160.27713.892311.733277@underdog.wildbrain.com>
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