Consider the following instance of a relation R(A, B, C, D): A B C D a1 b1 c1 d1 a1
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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 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
Expert Answer:
Solution A No this instance does not satisfy B D This is because there are two tuples with the same View the full answer
Related Book For 
Operations and Supply Chain Management
ISBN: 978-1119444404
9th edition
Authors: Roberta S. Russell, Bernard W. Taylor
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Question Details
Chapter #
17
Section: Exercise Questions
Problem: 50
Posted Date: September 05, 2023 08:57:11