Re: Does entity integrity imply entity identity?
Date: Wed, 05 Aug 2009 11:15:40 -0300
Mr. Scott wrote:
> "Bob Badour" <bbadour_at_pei.sympatico.ca> wrote in message
>>Mr. Scott wrote: >> >>>>The entity integrity rule is generally presented as a subrule under >>>>Codd's rule 10. >> >>I don't know why you would say that when the description of the so-called >>"entity integrity" basically restates Rule 2 verbatim.
> I don't think that's true. Although the entity integrity rule implies the
> guaranteed access rule, the guaranteed access rule doesn't imply the entity
> integrity rule. The guaranteed access rule doesn't say anything at all
> about nulls.
As Martha would say: This is a good thing. Null was a bad idea in the first place. Received on Wed Aug 05 2009 - 16:15:40 CEST