Homework 7

Database Design

Henry Books Case

For the problems below do the following:

  1. Describe the needed changes
  2. Create ER diagrams representing he changes
  3. Save the ER diagrams as images, and place everything in a single word document to turn in.
Ray Henry is considering expanding the inventory at his book stores to include movie DVDs. He has some special ideas for how he wants to implement this change, and he needs you to help with database design activities. In each exercise, represent your answer in DBDL and with a diagram. You may use any of the styles presented in chapter 6 of the text for the diagram.

1. Design a database for Ray. He is interested in movie DVDs and wants to keep information on movies, actors, and directors in a database. The only user is Ray, and he needs to produce the following reports:

  • a. For each director, list his or her number and name and the year he or she was born. If the director is deceased, list the year of death.
  • b. For each movie, list its number, its title, the year the movie was made, and its type (for example, Comedy, Drama, or Science Fiction).
  • c. For each movie, list its number, its title, the number and name of its director, the critics’ rating, the MPAA rating (G, PG, PG-13, or R), the number of awards for which the movie was nominated, and the number of awards the movie won. (The critics rate the movie with a number of “stars.” Four stars is the top rating possible. Zero stars is the worst possible rating.)
  • d. For each lead actor starring in each movie, list his or her number, name, and birthplace and the year he or she was born. If the actor is deceased, list the year of death.
  • e. For each movie, list its number and title, along with the number and name of the actors who appeared in it.
  • f. For each lead actor starring in each movie, list his or her number and name, along with the number and name of the other movies in which the actor starred.
2. Expand the database design you created in Exercise 1 so that it will also support the following situation: Ray wants to start a DVD rental program at his stores. He refers to each of his customers as “members.” Each member in the club is assigned a number. He also stores the members’ names and addresses. In addition, he stores the number of rentals a member has made and the date the member joined the club. He periodically has promotions during which members can earn bonus units that they can later apply to the cost of renting DVDs. He needs to store the number of bonus units a member has earned.

3. Expand the database design you created in Exercise 1 and modified in Exercise 2 so that it will also support the following situation: Ray wants to store information about the DVDs the club owns. When the club purchases a DVD, Ray assigns it a number. Along with the number, he stores the number of the movie on the DVD, the date the DVD was purchased, the number of times it has been rented, and the number of the member who is cur- rently renting it. (If the DVD is not currently being rented, the member number will be null.) Ray also needs to store the number of the branch to which the DVD is assigned. Finally, Ray would like to store the history of the rental of each particular DVD. In particular, he needs to store the DVD number, date of the rental, date it was returned, and number of the member who rented the DVD. Assume a DVD could potentially be rented more than once on the same day. (Hint: Review the discussion of the categories of primary keys to determine what type of primary key would be appropriate for this relation.)

DbHW7Solution

Topic revision: r2 - 2013-11-27 - JimSkon
 
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