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Problem 2. [15 points] Suppose we have the following three tuples in a legal instance of a relation S with four attributes ABCD: t1 =
Problem 2. [15 points] Suppose we have the following three tuples in a legal instance of a relation S with four attributes ABCD: t1 = (1,7,9,1), t2 = (4,2,3,4), and t3 = (5,7,9,1). 1. Which of the following dependencies do not hold over the relational schema S and which one that could potentially hold? (a) A B (b) B C (c) B A (d) BC A (e) BC D 2. Can you identify any functional dependencies that do hold over S? (think carefully for this!)
Problem 2. [15 points] Suppose we have the following three tuples in a legal instance of a relation S with four attributes ABCD: t1 = (1,7,9,1), t2 = (4,2,3,4), and t3 = (5,7,9,1).
1. Which of the following dependencies do not hold over the relational schema S and which one that could potentially hold?
(a) A B (b) B C (c) B A (d) BC A (e) BC D 2. Can you identify any functional dependencies that do hold over S? (think carefully for this!)
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Essentials of Database Management
Authors: Jeffrey A. Hoffer, Heikki Topi, Ramesh Venkataraman
1st edition
133405680, 9780133547702 , 978-0133405682
