Logical layer

Person(personId, email, phoneNumber, name, DOB)
Instructor(instructorNumber) instructorNumber $\subseteq$ Person.personId
Student(studentNumber) studentNumber $\subseteq$ Person.personId

Course(courseNumber, name)

Enrolment(enrolmentId, studentNumber, courseNumber, grade) studentNumber $\subseteq$ Student.studentNumber, courseNumber $\subseteq$ Course.courseNumber

Teaches(instructorNumber, courseNumber) instructorNumber $\subseteq$ Instructor.instructorNumber, courseNumber $\subseteq$ Course.courseNumber