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Re: c.d.theory glossary - NULL

From: Laconic2 <laconic2_at_comcast.net>
Date: Wed, 28 Apr 2004 08:45:38 -0400
Message-ID: <U7ydnawVhemmOhLdRVn-jA@comcast.com>

"Alfredo Novoa" <alfredo_at_ncs.es> wrote in message news:408ec600.632719_at_news.wanadoo.es...
> The zero byte is at the physical level and the null at the logical
> level.

...
> The bit vector is at the physical level and the SQL nulls at the
> logical level.

In this case, it's a distinction without a difference. When the program that does a SELECT
receives a NULL through the SQL interface, that NULL came from somewhere. I'm telling you
where the data that gave rise to the NULL was stored. Received on Wed Apr 28 2004 - 07:45:38 CDT

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