Re: MV Keys

"Jon Heggland" <heggland_at_idi.ntnu.no> wrote in message news:MPG.1e776201c1ef10eb989792_at_news.ntnu.no...
> In article <440cb7e8$0$11062$e4fe514c_at_news.xs4all.nl>,
> mAsterdam_at_vrijdag.org says...
> > Jon Heggland wrote:
> > > dcressey says...
> > >>An alternative example would be:
> > >>Is (onions, mushrooms) equal to (mushrooms, onions)?
> > >>I bleieve I've aske this question several times.
> > >
> > > I think the answer is obvious: It is whatever we define it to be. We
> > > just have to make the decision at some point.
> >
> > This is like choosing the right or the left side of the road.
> > You don't. You may choose the country where you are going to
> > drive, but that's it.

> I don't get this analogy at all. If I have a pizza database, and for
> some reason want to model "toppings" as a single attribute, I will use a
> list if I (or the pizza place I'm making it for) want the topping order
> to matter, and a set if I don't. Where does the national government
> enter into it?

When you'll have to pick from an SQL DBMS or a Pick system ? Received on Tue Mar 07 2006 - 09:36:47 CET