Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
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Chapter 4, Problem 4.11RQ
Explanation of Solution
Identifier:
Identifier is an attribute which is used to uniquely identify a particular entity instances from an entity.
Note: An entity instance is an occurrence of a particular entity.
Composite identifier:
Composite identifier is combinations of two or more attributes in an entity that can be uniquely identify each instance in the entity...
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Chapter 4 Solutions
Database Concepts (8th 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
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Why is it sometimes better for a data model to exclude a certain data item from its representation?arrow_forwardIs there any evidence that structured English has been used in data processing models, and if so, what role did it play?arrow_forwardWhat is meant by cardinality and modality ?arrow_forward
- DFDs are getting more and more popular as a data and processing model. Do you have any idea why this is the case?arrow_forwardHow did the techniques of categorization and prediction do according to the criteria that were used?arrow_forwardUsing a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.arrow_forward
- What are the most important differences between a data item and a data property from the point of view of the data hierarchy? When it's said that a characteristic has reach, what exactly does that mean?arrow_forwardFrom what I can see, they have a lot of characteristics in common. What other sorts of metrics are there to choose from when assessing semantic similarity? and provide a comprehensive explanation of each one.arrow_forwardCan composite qualities be part of composite keys?arrow_forward
- There is a potential key for one of the components of a composite primary key. What would be your response if you found out this?arrow_forwardWhat is the most effective design pattern for data-generating and -processing applications? Explain the pattern in code or with two examples.arrow_forwardDefine the term composite identifier and give an example other than those used in this book. Define the term relationship and give an example other than those used in this book.arrow_forward
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