Assume that a course may or may not use a textbook, but that a tex definition is

Question

Assume that a course may or may not use a textbook, but that a tex definition is a book that is used in some course. A course may not use more than five books. Instructors teach from two to four courses. Supply (min, max) constraints on this diagram. State clearly any additional assumptions you make. t by 2. (15 points) Consider the following ER diagram. Additional assumptions are as follows. Each course is taught by exactly one instructor. Each textbook is used by at least one and can be used up to three courses. An instructor does not have to adopt a textbook for all courses. If'a text exists: it is used in some course, hence it is ac t exists: it is used in some course, hence it is adopted by some instructor who teaches that course. An instructor is considered to adopt a text if it is used in some course taught by that instructor. INSTRUCTOR TEACHES COURSE USES TEXT

Explanation / Answer

Ans:

1.An instructor does not have to adopt a textbook for all courses.

Why This: course may or may not use textbook.(if in course don't use textbook , An instructor no need to adopt textbook)

2.if a text exists:it is used in some course,hence it is adopted by some instructor who teaches that course

Why this: A text by definition is a book that used in some course

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