Re: XQuery question
Date: 20 May 2003 15:26:14 -0700
Message-ID: <4b45d3ad.0305201426.9cc5438_at_posting.google.com>
> > Here there are no relations between relation T_Car and T_Color. Some
> > might say T_Car has a "relation" to T_Color but this would not make
> > sense in rdm-speak since a relation is defined as "a set of tuples".
> > What formal word has rdm defined to described this type of "relation"
> > between T_Car and T_Color?
>
> The formal term is "Cartesian product". This is taken directly
> from set theory. This concept is sometimes also called a "cross
> product" (which is a slight misnomer), or a "product join".
In symbolic logic, one might say a car has a relation to color, and in ER model, one might say a car has a relationship to color. In rdm, a car has a cartesian product with color, would be equivalent? Received on Wed May 21 2003 - 00:26:14 CEST