Concepts of Database Management 7 Edition
Chapter 6 Review Questions
7.) A database at a college is required to support the following requirements. Complete the information-level design for this set of requirements. Use your own experience to determine any constraints you need that are not stated in the problem. Represent the answer in DBDL.
a.) For the department, store its number and name.
b.) For an advisor. store his or her number and name and the number of the department to which he or she is assigned.
c.) For a course, store it code an d description.
d.) For a student, store his or her number and name. For each course the student has taken, store the course code, course description, and grade received. In addition, store the number and name of each student’s advisor. Assume that an advisor may advise any number of students but that each student has only one advisor.
8.) List the changes you would need to make in your answer to question 7 if a student could have more than one advisor.
10.) Illustrate the physical-level design process by means of the design shown in Question 7. List the tables and identify the keys, and list the special restrictions that the program must enforce.
12.) Design a survey form of your own. Fill it out as it might have been completed during the database design for Premiere Products. For any questions you have too little information to answer, make a reasonable guess.
14.) Describe the different ways of implementing the one-to-one relationships. Assume you are maintaining information on office (office number, buildings, and phone numbers) and faculty (numbers and names). No office houses more than one faculty member; no faculty member is assigned more than one office. Illustrate the ways of implementing one-to-one relationships using offices and faculty. Which option would be best in each of the following situations?
a.) A faculty member must have an office, and each office must be occupied by a faculty member.
b.) A faculty member must have an office, but some offices are not currently occupied. You must maintain information about the unoccupied offices in an Office relation.
c.) Some faculty members do not have an office, but all offices are occupied.
d.) Some faculty members do not have an office, but some offices are not occupied.
16.) Describe the relationship between columns that can be null and entity subtypes. Under what circumstances would these columns lead to more than one entity subtype?
18.) Describe the entity-relationship model. How are entities, relationships, and attributes represented in this model? What is a composite entity? Describe the approach to diagrams that uses a crow’s foot. Describe how you would represent cardinality in an E-R diagram?