From: Bruno Wolff III <bruno@wolff.to>
To: Wei Weng <wweng@kencast.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: How do you compare (NULL) and (non-NULL)?
Date: Wed, 27 Oct 2004 10:36:43 -0500
Message-ID: <20041027153643.GA14288@wolff.to> (raw)
In-Reply-To: <417EB238.1000109@kencast.com>
References: <417EB238.1000109@kencast.com>
On Tue, Oct 26, 2004 at 16:23:20 -0400,
Wei Weng <wweng@kencast.com> wrote:
> In the following query
>
> SELECT Parent FROM Channels ORDER BY Parent ASC;
>
> If I have a couple of (NULL)s in the field [Parent], they will be listed at
> the bottom of the query result.
>
> Is it because PostgreSQL considers (NULL) as the biggest value? If I run
> the same query under MSSQL Server 2000, I get the exact opposite result
> regarding the order of (NULL)s and (non-NULL) values. They are listed at
> the very beginning of the query result.
If the order matters, you can order by IS NULL or IS NOT NULL.
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To: pgsql-sql@postgresql.org
Cc: bruno@wolff.to, wweng@kencast.com
Subject: Re: How do you compare (NULL) and (non-NULL)?
In-Reply-To: <20041027153643.GA14288@wolff.to>
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