Re: Normalisation 4NF

"Al" <question2004_at_btinternet.com> wrote in message news:cm3db4$gm7$1_at_hercules.btinternet.com...
> Hi
> Can any one help me understand the difference between 4NF and 1NF. These
> both refer to a field that has more than one value - so what is the
> difference?
>
> All books I have looked at only consider the 4NF on its own and
> none of them shows an example starting from 1NF and going through all
stages
> right to 4NF.
> So it is difficult for me to see why the multi-valued field has not been
> taken out
> when examining the repeating groups at the stage of 1NF.
>
> I appreciate a clear explanation or full example showing 1NF to 4NF..
>
> Al
>
>

I have never heard of any book that only discusses 4NF without having to go through all the steps and lower NFs to get there. Conclusion: you are a student who doesb't even understand the problem enough to even lie about it well. I'm wrong? Cite the books you are referring to. Received on Mon Nov 01 2004 - 09:23:38 CST