13th Edition

ISBN: 9780134773650

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 1, Problem 1.49PAE

In this chapter, we described four important data models and their properties: enterprise, conceptual, logical, and physical. In the following table, summarize the important properties of these data models by entering a Y (for yes) or an N (for no) in each cell of the table.

Chapter 1, Problem 1.49PAE, In this chapter, we described four important data models and their properties: enterprise,

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Chapter 1, Problem 1.48PAE

Chapter 2, Problem 2.1RQ

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Logical data modeling demonstrates how data is arranged and interconnected without considering how it will be stored or displayed. Because it is beneficial to think logically about facts. How can DFDs and these models operate together to store data, given that some or all of these systems use logical data models?

It is not necessary to think about how the data will be kept or displayed since logical data modeling explains how the data is arranged and links to one another. Why? Because it is beneficial to think about facts in an organized and logical manner. Due to the fact that some or all of these systems make use of logical data models, it is important to understand how DFDs and these models interact in order to store information.

Create a line of demarcation between the three different levels of data modeling.

Chapter 1 Solutions

Modern Database Management

Ch. 1 - Prob. 1.1RQ Ch. 1 - Prob. 1.2RQ Ch. 1 - Prob. 1.3RQ Ch. 1 - Prob. 1.4RQ Ch. 1 - Prob. 1.5RQ Ch. 1 - Prob. 1.6RQ Ch. 1 - Prob. 1.7RQ Ch. 1 - How are relationships between tables expressed in...Ch. 1 - What does the term data independence mean, and why...Ch. 1 - Prob. 1.10RQ

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