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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
The participation Constraints shows whether the existence of an entity depends on its being associated to another entity by the relationship type. There are two kinds of participat
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