Example A university registrar’s office maintains data about the following entities: (a) courses, including number, title, credits, syllabus, and prerequisites;

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Example A university registrar’s office maintains data about the following entities: (a) courses, including number, title, credits, syllabus, and prerequisites; (b) course offerings, including course number, year, semester, section number, instructor(s), timings, and classroom; (c) students, including student-id, name, and program; and (d) instructors, including identification number, name, department, and title. Further, the enrollment of students in courses and grades awarded to students in each course they are enrolled for must be appropriately modeled. Construct an E-R diagram for the registrar’s office.Document all assumptions that you make about the mapping constraints. Sunday, January 13, 2019Sunday, January 13, 2019

Entity sets student ---- sid, name, program instructor --- id, name, dept, title course --- syllabus, courseno, title, credits, prerequisites course-offering --- secno, year, semester, time, room course-offering is a weak entity set dependent on course Sunday, January 13, 2019Sunday, January 13, 2019

Relationship sets enrols --- each student can enroll in several courses, grade must be kept relationship attribute --- grade teaches --- an instructor can teach several sections is-offered --- multiple sections of a course may be offered requires --- prerequisite, maincourse Sunday, January 13, 2019Sunday, January 13, 2019

Sunday, January 13, 2019Sunday, January 13, 2019

Reducing the E-R diagram to tables Entities student table course sid name program courseno title syllabus credits Sunday, January 13, 2019Sunday, January 13, 2019

instructor course-offerings iid name dept title courseno secno year semester time room Sunday, January 13, 2019Sunday, January 13, 2019

Relationships enrols teaches requires sid courseno secno semester year grade courseno secno semester year iid maincourse prerequisite Sunday, January 13, 2019Sunday, January 13, 2019