Selected exercises Chapter 3, Elmasri & Navathe
This material has been taken from draft Pre-Publication Material, Copyright AWL2004
CHAPTER 3: DATA MODELING USING THE ENTITY-RELATIONSHIP MODEL
Answers to Selected Exercises
3.16 Consider the following set of requirements for a university database that is used to
keep track of students' transcripts. This is similar but not identical to the
database shown in Figure 1.2:
(a) The university keeps track of each student's name, student number, social
security number, current address and phone, permanent address and phone,
birthdate, sex, class (freshman, sophomore, .
.., 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.
(b) 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.
(c) 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
(d) 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.
(e) 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.