Question
Suppose we have the following three tuples in a legal instance of a relation S with four attributes ABCD: t1 = (1,3,3,1), t2 = (4,2,3,4),
Suppose we have the following three tuples in a legal instance of a relation S with four attributes ABCD: t1 = (1,3,3,1), t2 = (4,2,3,4), and t3 = (5,3,3,1).
(a) Which of the following dependencies do not hold over the relational schema S?
(i) A -> B
(ii) B-> A
(iii) BC -> A
(iv) BC -> D
(b) Can you identify any functional dependencies that do hold over S?
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Statistical And Scientific Database Management Fifth International Conference V Ssdbm Charlotte N C Usa April 3 5 1990 Proceedings Lncs 420
Authors: Zbigniew Michalewicz
1st Edition
3540523421, 978-3540523420
