Re: On Formal IS-A definition
Date: 06 May 2010 23:14:33 GMT
>On May 3, 11:49 pm, r..._at_raampje.lan (Reinier Post) wrote:
>> Tegiri Nenashi wrote:
>> >Perhaps you are not comfortable with the idea than more than one tuple
>> >of Carnivores2 might represent each "entity"?
>> That's what I wrote, didn't I? It's strange. It's very unusual.
>> It doesn't fit in with ER modelling, for instance.
>Perhaps we should name the relvar CarnivoreEatsAnimal? It would
>correspond to the Eats relationship between Carnivore and Animal
>entities in the ER model.
Exactly: it's a relationship, not an entity, while IS-A is supposed to relate two entities.
-- ReinierReceived on Thu May 06 2010 - 18:14:33 CDT