Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 4, Problem 4.27RQ
Explanation of Solution
Data model:
Data model is the representation of object by different graphic symbol and illustrates the relationship between the object.
- It converts the complex
system design into the understood representation of data flows and processes. - Entity, attribute, and relationship are the three basic elements of data model.
- The data model can be divided into three types:
- Object based data model.
- Physical data model.
- Record based data model.
Purpose of data model:
The purpose of data model to define the relationship between data and describes how the data stored in computer memory...
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Chapter 4 Solutions
Database Concepts (7th Edition)
Ch. 4 - Prob. 4.1RQCh. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - What is a use case, and what is its purpose?Ch. 4 - Give an example of a data constraint.Ch. 4 - Prob. 4.6RQCh. 4 - Define the term entity, and give an example other...Ch. 4 - Explain the difference between an entity class and...Ch. 4 - Define the term attribute, and give examples for...Ch. 4 - Define the term identifier, and indicate which...
Ch. 4 - Prob. 4.11RQCh. 4 - Prob. 4.12RQCh. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - List and give an example of the three types of...Ch. 4 - Prob. 4.16RQCh. 4 - Prob. 4.17RQCh. 4 - Prob. 4.18RQCh. 4 - Define the term weak entity, and give an example...Ch. 4 - Explain the ambiguity in the definition of the...Ch. 4 - Define the term associative entity, and give an...Ch. 4 - Define the terms supertype, subtype, and...Ch. 4 - What is an exclusive subtype relationship? Give an...Ch. 4 - What is an inclusive subtype relationship? Give an...Ch. 4 - Prob. 4.25RQCh. 4 - Prob. 4.26RQCh. 4 - Prob. 4.27RQCh. 4 - Prob. 4.28RQ
Knowledge Booster
Similar questions
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- I need help to resolve the following activityarrow_forwardModern life has been impacted immensely by computers. Computers have penetrated every aspect of oursociety, either for better or for worse. From supermarket scanners calculating our shopping transactionswhile keeping store inventory; robots that handle highly specialized tasks or even simple human tasks,computers do much more than just computing. But where did all this technology come from and whereis it heading? Does the future look promising or should we worry about computers taking over theworld? Or are they just a necessary evil? Provide three references with your answer.arrow_forwardWhat are the steps you will follow in order to check the database and fix any problems with it? Have in mind that you SHOULD normalize it as well. Describe in full, consider the following:• Taking the database offline is not allowed since people are connected to it.• Personal data might be bridged and not secured. Provide three refernces with you answerarrow_forward
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