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Consider the following six relation schemes and their corresponding sets of functional dependencies. In each case identify
a. All the candidate keys
b. The highest normal form of the relation (2NF, 3NF, BCNF).
R1 (W, X, Y, Z) XY→Z, Y→ W
R2 (K,L,M,N) KL→N, K→M
R3 (P,Q,R,S) P→Q, Q→R, R→S
R4 (T,U,V) T→U, U→T, T→V
R5 (W,X,Y,Z) Z→W, YZ→W, WY→XZ
R6 (A,B,C,D) AB→D, AC→D
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