Exercise 19.13 Consider a relation R with five attributes ABCDE. 1. For each of the following instances of R, state whether it violates (a) the FD BC - D and (b) the MVD BC → D: (a) { } (i.e., empty relation) (b) {(a,2,3,4,5), (2,a,3,5,5)} (c) {(a,2,3,4,5), (2,a,3,5,5), (a,2,3,4,6)} (d) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5)} (e) {(a,2,3,4,5), (2,a,3,7,5), (a,2,3,4,6)} (f) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5), (a,2,3,6,6)} () {(а,2,3,4,5), (а,2,3,6,5), (а,2,3,6,6), (а,2,3,4,6)} 2. If each instance for R listed above is legal, what can you say about the FD A B?
Exercise 19.13 Consider a relation R with five attributes ABCDE. 1. For each of the following instances of R, state whether it violates (a) the FD BC - D and (b) the MVD BC → D: (a) { } (i.e., empty relation) (b) {(a,2,3,4,5), (2,a,3,5,5)} (c) {(a,2,3,4,5), (2,a,3,5,5), (a,2,3,4,6)} (d) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5)} (e) {(a,2,3,4,5), (2,a,3,7,5), (a,2,3,4,6)} (f) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5), (a,2,3,6,6)} () {(а,2,3,4,5), (а,2,3,6,5), (а,2,3,6,6), (а,2,3,4,6)} 2. If each instance for R listed above is legal, what can you say about the FD A B?
Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Transcribed Image Text:Exercise 19.13 Consider a relation R with five attributes ABCDE.
1. For each of the following instances of R, state whether it violates (a) the FD BC
D and (b) the MVD BC →→ D:
(a) { } (i.e., empty relation)
(b) {(a,2,3,4,5), (2,a,3,5,5)}
(c) {(a,2,3,4,5), (2,a,3,5,5), (a,2,3,4,6)}
(d) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5)}
(е) {(а,2,3,4,5), (2,а, 3,7,5), (а,2,3,4,6)}
(f) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3,6,5), (a,2,3,6,6)}
(з) {(а,2,3,4,5), (а,2,3,6,5), (а,2,3,6,6), (а,2,3,4,6)}
2. If each instance for R listed above is legal, what can you say about the FD A
B?
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