Re: NULL

"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.au