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Consider the following UML diagram. Professor rank 1..3 PT-Info rating Instructor name pk office 0..1 { complete, disjoint} PTeach Assistant years Course course# pk dept 0..2 ATeach 3..6 (a) According to the diagram, what are the minimum and maximum total number of instructors for a given course? (b) According to the diagram, what is the minimum and maximum teaching load (number of courses) for professors? For assistants?

Consider the following UML diagram. Professor rank 1..3 PT-Info rating Instructor name pk office 0..1 { complete, disjoint} PTeach Assistant years Course course# pk dept 0..2 ATeach 3..6 (a) According to the diagram, what are the minimum and maximum total number of instructors for a given course? (b) According to the diagram, what is the minimum and maximum teaching load (number of courses) for professors? For assistants?

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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e. Consider the following UML diagram. Professor rank 1..3 PT-Info rating Instructor name pk office 0..1 { complete, disjoint} PTeach Assistant years Course course# pk dept 0..2 ATeach 3..6 (a) According to the diagram, what are the minimum and maximum total number of instructors for a given course? (b) According to the diagram, what is the minimum and maximum teaching load (number of courses) for professors? For assistants? (c) Translate the UML diagram to a relational schema. There are several possible automatic translations; use the translation for subclassing most appropriate for the specified properties as described in the diagram. (d) Specify a minimal key for each relation in your solution to part (c). (e) Suppose by default attribute values cannot contain null. Does your solution to part (c) require any attributes to permit null values?
Transcribed Image Text:e. Consider the following UML diagram. Professor rank 1..3 PT-Info rating Instructor name pk office 0..1 { complete, disjoint} PTeach Assistant years Course course# pk dept 0..2 ATeach 3..6 (a) According to the diagram, what are the minimum and maximum total number of instructors for a given course? (b) According to the diagram, what is the minimum and maximum teaching load (number of courses) for professors? For assistants? (c) Translate the UML diagram to a relational schema. There are several possible automatic translations; use the translation for subclassing most appropriate for the specified properties as described in the diagram. (d) Specify a minimal key for each relation in your solution to part (c). (e) Suppose by default attribute values cannot contain null. Does your solution to part (c) require any attributes to permit null values?
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