Modern Database Management (12th Edition)
12th Edition
ISBN: 9780133544619
Author: Jeffrey A. Hoffer, Ramesh Venkataraman, Heikki Topi
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.20PAE
For simplicity, subtype discriminators were left off many figures in this chapter. Add subtype discriminator notation in each figure listed below. If necessary, create a new attribute for the discriminator.
- Figure 3-2
- Figure 3-3
- Figure 34
- Figure 3-7
- Figure 3-7
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What do you mean specifically by attribute interpolation?
A college course may have one or more scheduled sections or may not have a scheduled section. Attributes of COURSE include Course ID, Course Name, and Units. Attributes of SECTION include Section Number and Semester ID. Semester ID is composed of two parts: Semester and Year. Section Number is an integer (such as 1 or 2) that distinguishes one section from another for the same course but does not uniquely identify a section. How did you model SECTION? Why did you choose this way versus alternative ways to model SECTION?
For simplicity, subtype discriminators were left off many figures in this chapter. Add subtype discriminator notation in each figure listed below. If necessary, create a new attribute for the discriminator.
Chapter 3 Solutions
Modern Database Management (12th Edition)
Ch. 3 - Define each of the following terms: supertype...Ch. 3 - Prob. 3.2RQCh. 3 - Contrast the following terms: supertype; subtype...Ch. 3 - State two conditions that indicate when a database...Ch. 3 - Prob. 3.5RQCh. 3 - Give an example (other than those discussed in the...Ch. 3 - What is the attribute inheritance? Why is it...Ch. 3 - Give an example of each of the following: a...Ch. 3 - What types of business rules are normally captured...Ch. 3 - What is the purpose of a subtype discriminator?
Ch. 3 - Prob. 3.11RQCh. 3 - In what ways is starting a data modeling project...Ch. 3 - Prob. 3.13RQCh. 3 - Prob. 3.14RQCh. 3 - What do you purchase when you acquire a packaged...Ch. 3 - Prob. 3.16RQCh. 3 - When is a member of a supertype always a member of...Ch. 3 - Examine the hierarchy for the university EER...Ch. 3 - Add a subtype discriminator for each of the...Ch. 3 - For simplicity, subtype discriminators were left...Ch. 3 - Refer to the employee EER diagram in Figure 3-2....Ch. 3 - Refer to the EER diagram for patients in Figure...Ch. 3 - Figure 3-13 shows the development Of entity...Ch. 3 - Refer to Problem and Exercise 2-44 in Chapter 2...Ch. 3 - For a library, the entity type HOLDING has four...Ch. 3 - A bank has three types of accounts: checking,...Ch. 3 - Refer to your answer to Problem and Exercise 2-4...Ch. 3 - Refer to your answer to Problem and Exercise 3-24...Ch. 3 - Prob. 3.29PAECh. 3 - Prob. 3.30PAECh. 3 - Develop an EER model for the following situation,...Ch. 3 - Draw an EER diagram for the following description...Ch. 3 - Prob. 3.33PAECh. 3 - Prob. 3.34PAECh. 3 - Based on the EER diagram constructed for Problem...Ch. 3 - Prob. 3.36PAECh. 3 - Prob. 3.37PAECh. 3 - Add the following to Figure 3-16: An EMPLOYMENT...
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- When using subtype associations, talk about the database table choices that are accessible.Decide the design you want to employ and talk about the relevant issues.arrow_forwardThe term "interpolation of attributes" is a little vague.arrow_forwardIn order to declare a variable, "type" alone is not sufficient. To phrase this another way, each variable has both a data type as well as some other form of attribute. This idea enables us to represent the characteristics of any variable; but, how can we put it to use?arrow_forward
- Let's say you wish to train and assess a classifier using just a little amount of data. Which approach would you use to assess the classifier? Why?arrow_forwardWhat does it imply precisely when someone says "Identifier attribute"?arrow_forwardWhen developing subtype associations, talk about the database table options.Discuss the factors that would influence your decision to choose one design over the others.arrow_forward
- To be more specific, what do you mean when you say "interpolation of characteristics"?arrow_forwardGive few special guidelines for naming attributes?arrow_forwardGive an example of each of the following: a. a supertype/subtype relationship where the disjoint rule applies b. a supertype/ subtype relationship where the overlap rule appliesarrow_forward
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