Re: The horse race

Volker Hetzer wrote:
> David Cressey schrieb:
> >
> > The gates aren't really ordered. The locations of the gates are ordered,
> > and the numbers painted on the gates are ordered, but the gates themselves
> > are not ordered.
> Or, to be more precise, one could define a variety of orders over the gates,
> like latitude, longitude, date/time of building, numbering, distance from left/right,
> even alphabetically according the the name of the horse or jockey in them for
> a particular race.
> Given the right attributes you can sort according to all those orders in your
> database.

Yes, exactly. *Any* relation R on SxS that is reflexive, antisymmetric, and transitive *is* by definition a partial order on S. It doesn't even have to have been generated by using a single attribute; it could be some combination thereof.  

Marshall Received on Wed Feb 22 2006 - 19:07:51 CET