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_at_news.ntnu.no>
Date: Thu, 9 Jun 2005 10:07:30 +0200
Message-ID: <MPG.1d121730647ad92b98968c_at_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?
-- JonReceived on Thu Jun 09 2005 - 10:07:30 CEST