Re: So let me get this right: (Was: NFNF vs 1NF ...)

David Cressey wrote:
>
> 3. The elimination process referenced above and outlined later in the paper
> proves that this elimination doe not reduce the expressive power of the
> reulting normalized collection of relations.

Strictly speaking that is not exactly true. There is theoretical work that shows that sometimes you cannot flatten relations without losing information unless you cheat by introducing new domain values for encoding the removed sets.

• Jan Hidders