Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Navigation question

Re: Navigation question

From: dawn <dawnwolthuis_at_gmail.com>
Date: 17 Feb 2007 06:47:32 -0800
Message-ID: <1171723652.577195.84760@v45g2000cwv.googlegroups.com>


On Feb 16, 10:10 pm, "Marshall" <marshall.spi..._at_gmail.com> wrote:
> On Feb 16, 1:10 pm, "dawn" <dawnwolth..._at_gmail.com> wrote:
>
>
>
> > On Feb 16, 2:42 pm, "Marshall" <marshall.spi..._at_gmail.com> wrote:
> > > On Feb 16, 10:11 am, "dawn" <dawnwolth..._at_gmail.com> wrote:
> > > > On Feb 16, 10:48 am, "Marshall" <marshall.spi..._at_gmail.com> wrote:
>
> > > If navigation and iteration are independent,
>
> > they are separate concepts
>
> > > then you ought to be
> > > able to rewrite my navigational, iterative pseudocode into
> > > a style that is navigational but not iterative, and has roughly
> > > the same network performance as the SQL I proposed.
>
> > That does not logically follow. I am not speaking in favor of
> > iteration, nor am I suggesting that one should always navigate. But
> > one can navigate without iterating and, depending on your precise
> > definition of navigation, can also iterate without navigating.
>
> > > Please either 1) do so or 2) acknowledge that iteration
> > > and navigation are not in fact independent.
>
> > They are separate concepts, but there certainly can be instances where
> > neither is appropriate. There might also be cases where if you want
> > to iterate, you will also navigate or vice versa, but that is not
> > essential. One does not imply the other.
>
> If one does not imply the other,

That does not mean that in every situation one can use the one without the other. It simply means that the one does not imply the other. One of us must be using flawed logic. Let me know if I'm the one not being logical, as I do wish to correct that, but at this point it seems to me that you bringing up a case where if one were to use the one they would need to use it in conjunction of the other would mean that one of these implies the other. Thanks. --dawn

> then you ought to be
> able to rewrite my iterative pseudocode in a style that
> is navigational but not iterative. I'll drop the efficiency
> part of the challenge, which removes any issues you
> might have with whether the technique is appropriate
> or the best fit or whatever.
>
> Marshall
Received on Sat Feb 17 2007 - 08:47:32 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US