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A University database contains information about students (identified by social security number, or SSN) and courses...

A University database contains information about students (identified by social security number, or SSN) and courses (identified by courseid). Students enroll in courses; each of the following situations concerns the Enrolls-In relationship set. For each situation, draw an ER diagram that describes it (assuming no further constraints hold).

1.Students can enroll in the same course in several semesters, and each offering must be recorded.

2. Students can enroll in the same course in several semesters, and only the most recent such enrolling needs to be recorded. (Assume this condition applies in all subsequent questions.)

3. Every student must enroll in some courses.

4.Every student enrolls in exactly one course (no more, no less).

5. Every student enrolls in exactly one course (no more, no less), and every course must be enrolled by some students.

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