1. Define the term user view as it applies to database design. 2. What is the purpose...

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Question:

1. Define the term user view as it applies to database design.

2. What is the purpose of breaking down the overall design problem into a consideration of individual user views?

3. Under what circumstances would you not need to break down an overall design into a consideration of individual user views?

4. The information-level design method presented in this chapter contains steps that must be repeated for each user view. List the steps and briefly describe the kinds of activities that must take place at each step.

5. Describe the function of each of the following types of keys: primary, alternate, secondary, and foreign.

6. 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 a 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 its code and description (for example, MTH110 or Algebra).

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 the student’s advisor. Assume that an advisor may advise any number of students but that each student has just one advisor.

7. List the changes you would need to make in your answer to Question 7 if a student could have more than one advisor.

8. Suppose in addition to the requirements specified in Question 7, you must store the number of the department in which the student is majoring. Indicate the changes this would cause in the design in the following two situations:

a. The student must be assigned an advisor who is in the department in which the student is majoring.

b. The student’s advisor does not necessarily have to be in the department in which the student is majoring.

9. Describe the different ways of implementing one-to-one relationships. Assume you are maintaining information on offices (office numbers, 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