Re: Basic question?What 's the key if there 's no FD(Functional Dependencies)?

NENASHI, Tegiri schreef:

> Jan Hidders wrote:
> > Do you know of any results that might be interesting for database
> > theory and could not already be shown with good old set theory?
>
> The categorical sketches to use for universal view updatability:
>
> Michael Johnson and Robert Rosebrugh.
> Universal view updatability

That's not a result but a reformulation of the problem in new terminology. What does it learn us that we didn't know already from work by for example Georg Gottlob or Stephen Hegner?

• Jan Hidders