Re: Why using "Group By"

"Bob Badour" <bbadour_at_golden.net> wrote in message news:bI7ca.2$7Z2.139401_at_mantis.golden.net...
> "Mikito Harakiri" <mikharakiri_at_ywho.com> wrote in message
> Since I first observed the problem with sybase in 1994 four years before
> Date's article, I doubt the problem has anything to do with that
particular
> article. And in any case, the result in sybase is not the same as the
> interpretation you suggested.

OK.

> Further, having just re-read the article, I do not see where Date proposed
> any such thing.

A transformation of "group by" to scalar subquery is certinly there, although, I'm uncertain if the verb "proposed" could be really applied to what he said.

> > What is logical identity, that you refer to so often?
>
> Are you saying that you are unfamiliar with Codd's "12 Rules"? Or are you
> saying you are unfamiliar with the concept of identity? Or are you saying
> you are unfamiliar with the logical level of discourse?

Ah, those 12 apostols! I've read that article maybe twice, but those rules are constantly slipping my mind. Unlike really exciting things like "principle of equivalence of mass and inertia". Either, there is something wrong with me, or those rules aren't really worth much. Could somebody be so kind to reduce the number and formulate one or two really fundamental principles instead? Like relational closure, for example? Received on Thu Mar 13 2003 - 23:32:57 CET