Re: Please help me with Relational Database design

From: Jan Hidders <>
Date: 6 Mar 2003 10:43:21 +0100
Message-ID: <>

_at_s wrote:
>"Jan Hidders" <> 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...

Yet that is really the only way to learn it.

>Well, when I come across new problems, I'll post it right here, ok?

Great! But since this newsgroup is not a homework-service you should not forget to show to us that you made a serious effort to solve it yourself, and not be disappointed if all you get is a hint. You will learn more that way.

Good luck,

  • Jan Hidders
Received on Thu Mar 06 2003 - 10:43:21 CET

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