Re: Functional Dependency to constrain a relation to exactly one element?

J M Davitt schreef:

>
> First question: does the empty relation satisfy all INDs, too?

Since INDs usually hold between different relations it is more appropriate to ask whether the empty database satisfies all INDs. The anser is yes.

And in case you wondered, yes, the empty relation satisfies also all MVDs and JDs.

• Jan Hidders