13th Edition

ISBN: 9780136709299

Author: Hoffer

Publisher: PEARSON

Concept explainers

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 2.23PAE

A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E-R diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer.

Can a customer have an unlimited number of plans?
Can a customer exist without a plan?
Is it possible to create a plan without knowing who the customer is?
Does the operator want to limit the types of handsets that can be linked to a specific plan type?
Is it possible to maintain data regarding a handset without connecting it to a plan?
Can a handset be associated with multiple plans?
Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24?
Is the company able to track a manufacturer without maintaining information about its handsets?
Can the same operating system be used on multiple handset types?
There are two relationships between Customer and Plan. Explain how they differ.
Characterize the degree and the cardinalities of the relationship that connects Customer to itself. Explain its meaning.
Is it possible to link a handset to a specific customer in a plan with multiple customers?
Can the company track a handset without identifying its operating system?

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Chapter 2, Problem 2.22RQ

Chapter 2, Problem 2.24PAE

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Chapter 2 Solutions

MODERN DATABASE MGMT.(PEARSON CHANNEL)

Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Match the following terms and definitions....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 - Give an example, Other than those described in...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 - Prob. 2.24PAE 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 - Prob. 2.29PAE 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 - Figure 2-27 represents a situation of students who...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. 2.46PAE 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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