Database Theory - Keys and functional dependencies?

I want to solve these exercises:

EXCERCISE:
Find out all Keys (Primary/Foreign) for the following Relation-Types and the kind of Normalization (1NF, 2NF, 3NF, BCNF):

1. R1 (A,B,C,D) A -> B B -> A AC -> D
2. R2 (A,B,C,D,E) ABC -> D B -> E A -> C
3. R3 (A,B,C,D,E,F) A -> B D -> B CE -> AD A -> F

Thank you for your support!

Christian Hoecht Received on Tue Feb 12 2002 - 13:04:14 CET