Modern Database Management (12th Edition)

12th Edition

ISBN: 9780133544619

Author: Jeffrey A. Hoffer, Ramesh Venkataraman, Heikki Topi

Publisher: PEARSON

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of …

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Textbook Question

Chapter 2, Problem 2.21RQ

Explain the distinction between entity type and entity instance.

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Chapter 2, Problem 2.20RQ

Chapter 2, Problem 2.22RQ

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Explain the distinction between entity type and entity instance.

Explain the difference between an entity class and an entity instance.

Explain entity sets.

Chapter 2 Solutions

Modern Database Management (12th Edition)

Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Prob. 2.2RQ Ch. 2 - Contrast the following terms: stored attribute;...Ch. 2 - Prob. 2.4RQ Ch. 2 - Prob. 2.5RQ Ch. 2 - Prob. 2.6RQ Ch. 2 - State six general guidelines for naming data...Ch. 2 - Prob. 2.8RQ Ch. 2 - Prob. 2.9RQ Ch. 2 - State three conditions that suggest the designer...

Ch. 2 - List the four types of cardinality constraints,...Ch. 2 - Prob. 2.12RQ Ch. 2 - What is the degree of a relationship? List the...Ch. 2 - Give an example (Other than those described in...Ch. 2 - Give an example of each of the following, other...Ch. 2 - Give an example of the use of effective (or...Ch. 2 - State a rule that says when to extract an...Ch. 2 - Prob. 2.18RQ Ch. 2 - In addition to explaining what action is being...Ch. 2 - For the Manages relationship in Figure 2-12a,...Ch. 2 - Explain the distinction between entity type and...Ch. 2 - Why is it recommended that every ternary...Ch. 2 - A cellular operator needs a database to keep track...Ch. 2 - For each of the descriptions below, perform the...Ch. 2 - Answer the following questions concerning Figure...Ch. 2 - Prob. 2.26PAE Ch. 2 - You may have been assigned a CASE or a drawing...Ch. 2 - Consider the two E-R diagrams in Figure 2-25 Q,...Ch. 2 - The entity type STUDENT has the following...Ch. 2 - Are associative entities also weak entities? Why...Ch. 2 - Because Visio does not explicitly show associative...Ch. 2 - Figure 2-26 shows a grade report that is mailed to...Ch. 2 - Prob. 2.33PAE Ch. 2 - The Is Married To relationship in Figure 2-12a...Ch. 2 - Prob. 2.35PAE Ch. 2 - Figure 2-28 shows two diagrams (A and B), both of...Ch. 2 - Prob. 2.37PAE Ch. 2 - Review Figure 2-8LQ and Figure 2-22. Identify any...Ch. 2 - Prob. 2.39PAE Ch. 2 - Prob. 2.40PAE Ch. 2 - Prob. 2.41PAE Ch. 2 - Prob. 2.42PAE Ch. 2 - Prob. 2.43PAE Ch. 2 - Prob. 2.44PAE Ch. 2 - Prob. 2.45PAE Ch. 2 - Prob. 2.47PAE Ch. 2 - Prob. 2.48PAE Ch. 2 - Draw an ERD for the following situation. (State...Ch. 2 - Prob. 2.50PAE Ch. 2 - Prob. 2.51PAE Ch. 2 - Review your answer to Problem and Exercise 2-49 if...

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