? Finding Functional dependancies and Keys

I have a question on methodology of working with FD's (functional dependancies) and their notation.

Given the relation R (A,B,C,D,E) and the following FD's

  AB -> C
  AC -> D
 CDE -> AB
   BD -> ?

(1) find ?
(2) what are the keys to the relation

What is would like to know is the steps / method to find the answer - not just the answer.

Thanks for your help, Received on Sun Nov 25 2001 - 05:45:48 CET