Question
Consider the following instance of a relation R(A, B, C, D): A B C D a1 b1 c1 d1 a1 b2 c1 d2 a2 b1
Consider the following instance of a relation R(A, B, C, D):
A B C D
a1 b1 c1 d1
a1 b2 c1 d2
a2 b1 c1 d1
Explain
A. Does this instance satisfy B → D?
B. Does this instance satisfy BC → D?
C. Does this instance satisfy C → D?
D. Can the following be proven using Armstrong's Axioms? Explain your answer. If BC → D and B → D, then C → D
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Solution A No this instance does not satisfy B D This is because there are two tuples with the same ...
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Operations and Supply Chain Management
Authors: Roberta S. Russell, Bernard W. Taylor
9th edition
978-1119320975, 1119320976, 978-1119329367, 1119329361, 978-1119444404
