Re: Navigation vs Relational operators
From: Paul G. Brown <paul_geoffrey_brown_at_yahoo.com>
Date: 13 May 2004 10:00:50 -0700
Message-ID: <57da7b56.0405130900.30cc43f_at_posting.google.com>
Date: 13 May 2004 10:00:50 -0700
Message-ID: <57da7b56.0405130900.30cc43f_at_posting.google.com>
"x" <x-false_at_yahoo.com> wrote in message news:<40a33627_at_post.usenet.com>...
> **** Post for FREE via your newsreader at post.usenet.com ****
>
> In what way is "navigation" different from using relational operators ?
How do you 'navigate' union / projection / restriction / intersection / outer-join / anti-join / difference / division?
Only equi-join along a join dependency has the 'flavor' of navigation.
The obvious difference is that all relational operators have a precise definition. "Navigation" (as its quotation marks implies) don't. Received on Thu May 13 2004 - 19:00:50 CEST