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Specification Functional Dependency

Specification Functional Dependency

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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Specification Functional Dependency 1. Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. For each one of the relational schemas identify its highest normal form. Remember that the identification of a normal form requires analysis of the valid functional dependencies and the minimal keys. Provide justification of each answer. A solution with no comprehensive justification scores no marks. i. R1(A, B, С, D, E, F, G, H) F%3D {CH — G,A — ВС, Е — А,F — EG} ii. R2 = (S,C,L, D) F = {(L,D) → S, (L, D) → C,L → D} R3(A,B,C,D,E) F = {ABC → D, D → A}
Transcribed Image Text:Specification Functional Dependency 1. Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. For each one of the relational schemas identify its highest normal form. Remember that the identification of a normal form requires analysis of the valid functional dependencies and the minimal keys. Provide justification of each answer. A solution with no comprehensive justification scores no marks. i. R1(A, B, С, D, E, F, G, H) F%3D {CH — G,A — ВС, Е — А,F — EG} ii. R2 = (S,C,L, D) F = {(L,D) → S, (L, D) → C,L → D} R3(A,B,C,D,E) F = {ABC → D, D → A}
Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. R(A,B, C,D, E, H) Functional Dependency: A → B, BC → D,E → C,D → A (i) Find all the minimal super key of the relational table R. List the derivations of all minimal keys. Identify the highest normal form of the relational R. Remember that the identification of a normal form requires analysis of the valid functional dependencies. Decompose the relational table R into minimal number of normalized relational tables in BCNF. Remember to indicate the primary key and foreign keys (if any). (ii) (iii)
Transcribed Image Text:Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. R(A,B, C,D, E, H) Functional Dependency: A → B, BC → D,E → C,D → A (i) Find all the minimal super key of the relational table R. List the derivations of all minimal keys. Identify the highest normal form of the relational R. Remember that the identification of a normal form requires analysis of the valid functional dependencies. Decompose the relational table R into minimal number of normalized relational tables in BCNF. Remember to indicate the primary key and foreign keys (if any). (ii) (iii)
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