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Re: CJ Date on Missing Information

From: Jonathan Leffler <jleffler_at_earthlink.net>
Date: Mon, 20 Mar 2006 05:36:33 GMT
Message-ID: <BbrTf.6658$Bj7.5499@newsread2.news.pas.earthlink.net>


Anne & Lynn Wheeler wrote:
> "Paul Mansour" <paul_at_carlislegroup.com> writes:

>> I've just read "The Default Values Approach to Missing Information" in
>> Date's Database Writings 1989-1991.  [...]

>
> old posting that references a dec92 article in database programming
> and design by date on dealing with unknown values titled "An
> Explanation of why three-valued logic is a mistake (Why Accept Wrong
> Answers?)"
> http://www.garlic.com/~lynn/2003q.html#40 How to cope with missing values - NULLS?
> http://www.garlic.com/~lynn/2003q.html#41 How to cope with missing values - NULLS?

Getting 404 errors on those - can you confirm or correct them?

-- 
Jonathan Leffler                   #include <disclaimer.h>
Email: jleffler_at_earthlink.net, jleffler_at_us.ibm.com
Guardian of DBD::Informix v2005.02 -- http://dbi.perl.org/
Received on Sun Mar 19 2006 - 23:36:33 CST

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