Consider a grade book database in which instructors within an academic department maintain scores/points obtained by individual students in their classes. The data requirements are summarized as follows:
• Students are identified by a unique student id, their first and last names, and an email address.
• The instructor teaches certain courses each term. The courses are uniquely identified by a course number, a section number, and the term in which they are taught. The instructor also assigns grade cutoffs (example 90, 80, 70, and 60) for letter grades A, B, C, D, and F for each course he or she teaches.
• Students are enrolled in courses taught by the instructor.
• Each course being taught by the instructor has a number of grading components (such as mid-term, final exam, project, etc.). Each grading component has a maximum number of points (such as 100 or 50) and a weight (such as 20% or 10%). The weights of all the grading components of a course usually add up to 100.
• Finally, the instructor records the points earned by each student in each of the grading components in each of the courses. For example, student with id=1234 earns 84 points for the grading component mid-term for the course CSc 2310 section 2 in the fall 2005 term. The mid-term grading component may have been defined to have a maximum of 100 points and a weight of 20% of the course grade.
Design an enhanced Entity-Relationship diagram for the grade book database and enter the design using a data-modeling tool such as ERWin.