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Answer the following questions: 7. Provide the attribute closure of set of attributes C (hence, C+) and of set of attributes EA (hence, (EA)*) with respect to S. Explain your steps.

Answer the following questions: 7. Provide the attribute closure of set of attributes C (hence, C+) and of set of attributes EA (hence, (EA)*) with respect to S. Explain your steps.

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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D3 The human computer Consider the relational schema r(A, B,C, D, E) and the following set of functional dependencies: S = {AB → D, AC → E, BC → D,C – A, D → A, E → B}. Answer the following questions: 7. Provide the attribute closure of set of attributes C (hence, C+) and of set of attributes EA (hence, (EA)*) with respect to S. Explain your steps. 8. Compute the closure S*. Explain your steps. Based on the closure, indicate which attributes are superkeys and which attributes are keys. HINT: A superkey is a set of attributes that determines all attributes from r. A key k is a superkey of minimal size (if we remove any attribute from k, it is no longer a key). 9. Provide a minimal cover for S. Explain your steps.
Transcribed Image Text:D3 The human computer Consider the relational schema r(A, B,C, D, E) and the following set of functional dependencies: S = {AB → D, AC → E, BC → D,C – A, D → A, E → B}. Answer the following questions: 7. Provide the attribute closure of set of attributes C (hence, C+) and of set of attributes EA (hence, (EA)*) with respect to S. Explain your steps. 8. Compute the closure S*. Explain your steps. Based on the closure, indicate which attributes are superkeys and which attributes are keys. HINT: A superkey is a set of attributes that determines all attributes from r. A key k is a superkey of minimal size (if we remove any attribute from k, it is no longer a key). 9. Provide a minimal cover for S. Explain your steps.
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