Exercise 19.6 Suppose that we have the following three tuples in a legal instance of a relation schema S with three attributes ABC (listed in order): (1,2,3), (4,2,3), and (5,3,3).
1. Which of the following dependencies can you infer does not hold over schema S?
(a) A → B, (b) BC → A, (c) B → C
2. Can you identify any dependencies that hold over S?
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