Re: RA with MV attributes

On Jan 17, 10:27 pm, "David" <davi..._at_iinet.net.au> wrote:
> Marshall wrote:
>
> > > From Wikipedia : "... a binary operation on a set S is a binary
> > > function from S and S to S"
>
> > Natural join is a binary operation closed over the set of all
> > relations.
> The very idea to put all relations of all "types" into a single set
> suggests that the "type" has now become a property of the relation
> value.

Meh. This is the point in the conversation at which Han Solo pulls out his blaster and shoots the communication console. Without a formal definition of what it means for something be a property of something else, the argument is almost entirely a matter of word choice.

Marshall Received on Thu Jan 18 2007 - 09:10:30 CET