1 and 5

Exercise 19.10 Suppose you are given a relation R(A,B, C.D). For each of the following sets of FDs, assuming they are the only dependencies that hold for R, do the following: (a) Identify the candidate key(s) for R. (b) State whether or not the proposed decOlnposition of R into smaller relations is a good decolllposition and briefly explain why or why not 1. B C, D-A: decornpose into BC and AD . A B, B C CD decOInpose into AB, AD and CD