The following figure shows the relational schema for this example. Employee in this example includes teachers and support personnel. Teachers include instructors, professors, and graduate students in a workstudy program. In this example, one set of type codes is used for all these types of employees.
There are two intersection entities in this schema: Student/Course and Employee/Course. These handle the two many-to-many relationships: 1) between Student and Course, and 2) between Employee and Course. In the first case, a Student may take many Courses and a Course may be taken by many Students. Similarly, in the second case, an Employee (one of the types of Teachers) may teach many Courses and a Course may be taught by many Teachers. Also see more on many-to-many relationships (new window).
Answered by: siva85
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