Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 2, Problem 16P

(a)

Explanation of Solution

The business rules for the MegaCo Corporation’s divisions are as follows:

  • Each department has many employees but each employee works for only one department.
  • Each department is managed by one employee and each employee can manage only one department at a time.

Crow’s Foot ERD:

(b)

Explanation of Solution

The business rules can be written as follows.

  • A customer can download many e-books from Books Online and each of the books can be downloaded by many customers.

Crow’s Foot ERD:

(c)

Explanation of Solution

The business rule is an airline can be assigned to fly many flights but each flight is flown by only one airliner.

Crow’s Foot ERD:

(d)

Explanation of Solution

The business rule for “KwikTite” Corporation is as follows.

  • Each factory is located in a region and each region can be a home for many factories.
  • Each factory employs many employees but each employee is employed by only one factory.

Crow’s Foot ERD:

(e)

Explanation of Solution

The business rule is an employee may have earned many degrees and each degree may have been earned by many employees.

Crow’s Foot ERD:

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Write a program that simulates a Magic 8 Ball, which is a fortune-telling toy that displays a random response to a yes or no question. In the student sample programs for this book, you will find a text file named 8_ball_responses.txt. The file contains 12 responses, such as “I don’t think so”, “Yes, of course!”, “I’m not sure”, and so forth. The program should read the responses from the file into a list. It should prompt the user to ask a question, then display one of the responses, randomly selected from the list. The program should repeat until the user is ready to quit. Contents of 8_ball_responses.txt:  Yes, of course! Without a doubt, yes. You can count on it. For sure! Ask me later. I'm not sure. I can't tell you right now. I'll tell you after my nap. No way! I don't think so. Without a doubt, no. The answer is clearly NO. (You can access the Computer Science Portal at www.pearsonhighered.com/gaddis.)
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How does encryption prevent a hacker from getting your data
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