Re: NULL
From: mountain man <hobbit_at_southern_seaweed.com.op>
Date: Fri, 10 Jun 2005 01:00:20 GMT
Message-ID: <EC5qe.11729$F7.9930_at_news-server.bigpond.net.au>
Date: Fri, 10 Jun 2005 01:00:20 GMT
Message-ID: <EC5qe.11729$F7.9930_at_news-server.bigpond.net.au>
"Jan Hidders" <jan.hidders_at_REMOVETHIS.pandora.be> wrote:
>> What is lacking Codd's concise definition (rule 3)
>> for null data as "non-applicable data"?
>
> Read closely, that is not precisely how he defines it.
Are you referring to the part about being
"distinct from the empty character string
or a string of blank characters
and distinct from zero
or any other number" (in Rule 3),
or are you referring to Codd's work elsewhere, like his "Extending the DB RM ..."?
-- Pete Brown Falls Creek OZ www.mountainman.com.auReceived on Fri Jun 10 2005 - 03:00:20 CEST