Re: c.d.theory glossary - NULL
Date: Tue, 27 Apr 2004 10:50:16 -0300
Em Mon, 26 Apr 2004 07:55:50 -0400, Laconic2 escreveu:
> Special Values like "Not Available" or "Inapplicable" are really not
> values, if you think about them.
Granted, inapplicable indicates a failure in modelling, specifically in normalisation.
No, a domain is a set. There is no restriction to what you put there, you just have to take care to provide the operators and not complicate things unnecessarily...
> If there is a NULL bit for every cell, as there should be in a good
> RDBMS, it should be set to NULL in the cases listed above.
You unfortunately don't seem to have understood what is a NULL and what is the relational model. You seem to think SQL is relational. I fear that means you either can't or -- more probably -- don't want to learn otherwise, and thus your continued posting of such confused opinions make you a troll, if not a violent, man-eating, rock-fleshed one.
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