Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Reflections of a beautiful mind... Fundamental principle: Separation of Concerns

Re: Reflections of a beautiful mind... Fundamental principle: Separation of Concerns

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Tue, 25 Apr 2006 14:19:55 GMT
Message-ID: <feq3g.65561$VV4.1249115@ursa-nb00s0.nbnet.nb.ca>


Frank Hamersley wrote:
> Bob Badour wrote:
>

>> Frank Hamersley 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?

>
>
> Nothing said about "special" cases - FWICT they were exploding
> combinatorially for the general case.
>
> I was referring to the slides Darwen presented at Warwick Uni some time
> ago - "Missing info without nulls" which I perhaps erroneously
> associated with their TTM.
>
> I particularly like the foot note on page 9 ...
> <quote>
> 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.
> </quote>
>
> To me this triplet of sentences is tantamount to blowing your (sic)
> proverbial foot off with a 155mm field gun even moreso than simply
> selecting a 12 guage shotty for the job.
>
> But then I could be wrong!

Yes, indeed. Received on Tue Apr 25 2006 - 09:19:55 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US