Re: Please help me with Relational Database design
From: _at_s <edstasy_at_*nospam*home.nl>
Date: Thu, 6 Mar 2003 09:40:36 +0100
Message-ID: <b471ie$gfu$1_at_news2.tilbu1.nb.home.nl>
Date: Thu, 6 Mar 2003 09:40:36 +0100
Message-ID: <b471ie$gfu$1_at_news2.tilbu1.nb.home.nl>
"Jan Hidders" <jan.hidders_at_REMOVE.THIS.ua.ac.be> wrote :
> Because of reflexivity we can always, i.e., no matter what other FDs we
> already derived, add:
>
> (3) BC -> B
Ah I see.
Step 3 was the step I didn't understand. But this one is true because B is a
subset of BC, isn't it?
Like I said, it is very easy to see it when it's already solved. But when I
have to do it myself...
Well, when I come across new problems, I'll post it right here, ok?
Thanx!
_at_s
Received on Thu Mar 06 2003 - 09:40:36 CET