Design the following two tables that might be used in the Student Registration System. Note that the same student Id might appear in many rows of each of these tables.
a. A table implementing the relation CoursesRegisteredFor, relating a student’s Id and the identifying numbers of the courses for which she is registered
b. A table implementing the relation CoursesTaken, relating a student’s Id, the identifying numbers of the courses he has taken, and the grade received in each course
a. 
b. 
Specify the predicate corresponding to each of these tables.
Solution:
For the ?rst table: Student X is registered for Course Y
For the second table: Student X has taken Course Y and gotten Grade Z
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