From: Alexey Dashevsky <alex@kpgaz.chernigov.ua>
To: pgsql-sql@postgresql.org
Subject: Re: numeric fields and null
Date: Fri, 23 May 2003 08:51:49 +0300
Message-ID: <20030523055146.7929619327@kpgaz.chernigov.ua> (raw)
In-Reply-To: <20030522152454.P46888-100000@megazone23.bigpanda.com>
References: <20030522152454.P46888-100000@megazone23.bigpanda.com>
> > adhoc=# update users set postaladdressid=null where id=50;
> > UPDATE 1
> >
> > adhoc=# select id,postaladdressid from users where postaladdressid=null;
> > id | postaladdressid
> > ----+-----------------
> > (0 rows)
> >
> > Why did it not select record 50?
>
> Because NULL=NULL is not true (it's unknown). Use IS NULL if you want to
> see if something is NULL.
If in postgresql.conf set parameter transform_null_equals=TRUE ????
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To: pgsql-sql@postgresql.org
Cc: alex@kpgaz.chernigov.ua
Subject: Re: numeric fields and null
In-Reply-To: <20030523055146.7929619327@kpgaz.chernigov.ua>
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