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Consider the relational database schema R( A, B, C, D, E, F, G, H, I) with the following set of functional dependencies: {A} → {E, F} {A,B,C,D} → {G,H} {C,D,G} → {A,B,I} {H} → {I} A. Use the inference rules to show that {A,B,C,D} → {1}. B. Determine which ones of the following sets of attributes are superkeys and which ones are also candidate keys: {A,B,C,D} {C,D,G,H} {C,D,G} Justify your answer by computing the closures. ! C. Use the candidate keys that you have identified in part B to decompose the relation R such that it satisfies the 2NF.

Consider the relational database schema R( A, B, C, D, E, F, G, H, I) with the following set of functional dependencies: {A} → {E, F} {A,B,C,D} → {G,H} {C,D,G} → {A,B,I} {H} → {I} A. Use the inference rules to show that {A,B,C,D} → {1}. B. Determine which ones of the following sets of attributes are superkeys and which ones are also candidate keys: {A,B,C,D} {C,D,G,H} {C,D,G} Justify your answer by computing the closures. ! C. Use the candidate keys that you have identified in part B to decompose the relation R such that it satisfies the 2NF.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider the relational database schema R(A, B, C, D, E, F, G, H, 1) with the following set of functional dependencies: {A} → {E, F} {A,B,C,D} → {G,H} {C,D,G} → {A,B,I} • {H} → {I} A. Use the inference rules to show that {A,B,C,D} →{I}. B. Determine which ones of the following sets of attributes are superkeys and which ones are also candidate keys: - {A,B,C,D} - {C,D,G,H} {C,D,G} Justify your answer by computing the closures. C. Use the candidate keys that you have identified in part B to decompose the relation R such that it satisfies the 2NF.
Transcribed Image Text:Consider the relational database schema R(A, B, C, D, E, F, G, H, 1) with the following set of functional dependencies: {A} → {E, F} {A,B,C,D} → {G,H} {C,D,G} → {A,B,I} • {H} → {I} A. Use the inference rules to show that {A,B,C,D} →{I}. B. Determine which ones of the following sets of attributes are superkeys and which ones are also candidate keys: - {A,B,C,D} - {C,D,G,H} {C,D,G} Justify your answer by computing the closures. C. Use the candidate keys that you have identified in part B to decompose the relation R such that it satisfies the 2NF.
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