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Home -> Community -> Usenet -> comp.databases.theory -> Re: Does Codd's view of a relational database differ from that ofDate & Darwin? [M.Gittens]

Re: Does Codd's view of a relational database differ from that ofDate & Darwin? [M.Gittens]

From: Jon Heggland <heggland_at_idi.ntnu.no>
Date: Thu, 9 Jun 2005 10:07:30 +0200
Message-ID: <MPG.1d121730647ad92b98968c@news.ntnu.no> 





In article <42a6eb89$1_at_news.fhg.de>, savinov_at_host.com says...


> So I find NULL and empty set formally equivalent.




The empty set is equal to itself, and it has a type---set (loosely 
speaking). Is NULL equal to itself? (It is not in SQL.) What is its 
type?

-- 
Jon


Received on Thu Jun 09 2005 - 03:07:30 CDT












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