Re: Reflections of a beautiful mind... Fundamental principle: Separation of Concerns
Date: Tue, 25 Apr 2006 09:45:45 GMT
Bob Badour wrote:
>> Bob Badour wrote:
>>> For instance, the third principle would seem to argue strongly >>> against null and n-vl.
>> But isn't that the very technique (combinatorial explosion) that
>> D+D propose with D?
> > You have lost me here. How have they introduced a cominatorial > explosion of special cases?
I particularly like the foot note on page 9 ...
Nothing wrong with the predicates now! And we have reduced the salary part of the database to the simplest possible terms. Yes, some of the complicated queries get more difficult now, because we might have to combine these tables back together again, but the simple queries, such as “How much salary does each person (who has a known salary) earn?” and “Who earns no salary?” become trivial.
But then I could be wrong!
Cheers, Frank. Received on Tue Apr 25 2006 - 11:45:45 CEST