Question

Conceptual data diagram
The ABC university keeps track of each student's name, student number, social security
number (I C number), current address and phone, permanent address and phone, birthdate,
sex, class (alpha, Beta, Gamma ..., graduate), major department, minor department (if any),
and degree program (B.A., B.S., ..., Ph.D.). Some user applications need to refer to the city,
state, and zip of the student's permanent address, and to the student's last name. Both social
security number and student number have unique values for each student.
 Each department is described by a name, department code, office number, office phone,
and college. Both name and code have unique values for each department.
 Each course has a course name, description, course number, number of semester hours,
level, and offering department. The value of course number is unique for each course.
 Each section has an instructor, semester, year, course, and section number. The section
number distinguishes different sections of the same course that are taught during the same
semester/year; its values are 1, 2, 3, ...; up to the number of sections taught during each
semester.
 A grade report has a student, section, letter grade, and numeric grade (0, 1, 2, 3, 4 for F,
D, C, B, A, respectively).

Design an ER schema for this application, and draw an ER diagram for that schema.
Specify key attributes of each entity type and structural constraints on each relationship type.
Note any unspecified requirements, and make appropriate assumptions to make the
specification complete.

Answer 1

Please find below the steps to obtain an ERD for ABC university:

1. Find entities:

· Student

· Department

· Address

· Course

· Section

· GradeReport

2. Obtain relationship between entities:

· Student has one department as major department.

· Student has none or one department as minor department.

· Department offers many courses, whereas a course is offered by exactly one department.

· Course has many Section, whereas a section is obtained for one Course only.

· GradeReport has one student and one Section as owner entities.

3. Attributes of the entities:

*primary keys are bold and underlined

· Student(student_number,IC_number, name, birthdate,sex, class, degree program )

· Address(Address_id, type, address, phone)

· Department(department_code, name, office number, office phone, college)

· Course(course_number, course_name, description, total_semester_ hours,
level)

· Section(course, section number , instructor, semester_year)

· GradeReport(letter_grade, numeric_grade)

Assumptions:

1. Address type will be either permanent or current along with phone number

2. Student can have zero or many GradeReport when a student is new, the reports will be zero for him.

4. Creating ERD:

IC_number birthdate name sex type Address id address student_number class (1,1) Address Stdent has degree program phone (1,2) MM) (1,1) (1,M) department_code name has minor letter_grade 10.17 office_number numeric_grade <oelongs to ax (1,1) Department has major Grade Report (1,1) office_phone (0,M) (0,M) offers college for (1,M) (1.1) has Course Section (1,M) 통 section number course number instructor level semester_year name total_semester_ho urs description