A university database contains information about professors (identified by social security number, or SSN) and courses (identified by course-id). PROFESSORS teach courses; each of the following situations concerns the TEACHES relationship set. For each situation, draw an ER diagram that describes it (assuming no further constraints hold). (a) Professors can teach the same course in several semesters, and each offering must be recorded. (b) Professors can teach the same course in several semesters, and only the most recent such offering needs to be recorded. (Assume this condition applies in all subsequent questions.) (c) Every professor must teach some course. (d) Every professor teaches exactly one course (no more, no less). (e) Every professor teaches exactly one course (no more, no less), and every course must be taught by some professor. (f) Now suppose that certain courses can be taught by a team of professors jointly, but it is pos- sible that no one professor in a team can teach the course. Model this situation, introducing additional entity sets and relationship sets if necessary.
A university database contains information about professors (identified by social security number, or SSN) and courses (identified by course-id). PROFESSORS teach courses; each of the following situations concerns the TEACHES relationship set. For each situation, draw an ER diagram that describes it (assuming no further constraints hold). (a) Professors can teach the same course in several semesters, and each offering must be recorded. (b) Professors can teach the same course in several semesters, and only the most recent such offering needs to be recorded. (Assume this condition applies in all subsequent questions.) (c) Every professor must teach some course. (d) Every professor teaches exactly one course (no more, no less). (e) Every professor teaches exactly one course (no more, no less), and every course must be taught by some professor. (f) Now suppose that certain courses can be taught by a team of professors jointly, but it is pos- sible that no one professor in a team can teach the course. Model this situation, introducing additional entity sets and relationship sets if necessary.
Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
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please show all the work, draw the ER diagram
Transcribed Image Text:A university database contains information about professors (identified by social
security number, or SSN) and courses (identified by course-id). PROFESSORS teach courses;
each of the following situations concerns the TEACHES relationship set. For each situation,
draw an ER diagram that describes it (assuming no further constraints hold).
(a) Professors can teach the same course in several semesters, and each offering must be recorded.
(b) Professors can teach the same course in several semesters, and only the most recent such
offering needs to be recorded. (Assume this condition applies in all subsequent questions.)
(c) Every professor must teach some course.
(d) Every professor teaches exactly one course (no more, no less).
(e) Every professor teaches exactly one course (no more, no less), and every course must be
taught by some professor.
(f) Now suppose that certain courses can be taught by a team of professors jointly, but it is pos-
sible that no one professor in a team can teach the course. Model this situation, introducing
additional entity sets and relationship sets if necessary.
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