Re: The original version
Date: Fri, 06 Aug 2010 07:06:16 -0300
Message-ID: <4c5bdea8$0$11839$9a566e8b_at_news.aliant.net>
vldm10 wrote:
> On Aug 5, 2:41 am, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:
>
>>vldm10 wrote:
>>
>>>The authors of Anchor Modeling state that their model is based on the
>>>Sixth Normal Form. However, 6NF cannot secure binary structures. Let
>>>us consider a relation with five attributes that are mutually
>>>independent. This relation is in 6NF , thus it cannot be further
>>>decomposed. If we wish to get the history for each of its attributes,
>>>things become very complicated.
>>
>>Huh? Do you know what 6NF is?
>
> I guess I know?
> Do you know what 6NF is?
>
> 6NF is defined by the authors of the “Anchor Modeling” as follows:
> A table is in 6NF iff it satisfies no nontrivial join dependencies at
> all.
> ( http://www.anchormodeling.com/tiedostot/6nf.pdf )
>
> Maybe you can explain your thinking by using this definition?
How does a relation with 5 mutually independent attributes meet the definition of 6NF? Received on Fri Aug 06 2010 - 12:06:16 CEST