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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Expert Solution & Answer
Chapter 4, Problem 4.18RQ
Explanation of Solution
ID-dependent entity:
In the entity-relationship model, an identifier of one entity is dependent on the identifier of another entity and it is special kind of weak entity.
In entity-relationship model, id-dependent entity is represented as rounded corners.
Note: Identifier is an attribute which is used to uniquely identify a particular entity instances from an entity.
Example:
The example demonstrates one-to-many (optional) relationship between “STUDENT” and “ADDRESS” entity.
IE Crow’s Foot E-R diagram:
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Define the term ID-dependent entity, and give an example other than one used in this text. Draw an IE Crow’s Foot E-R diagram for your example.
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(Image attached).
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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
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- Design an Entity Relationship Diagram for the following example:arrow_forwardJust what does "weak entity type" mean? Is there a secret to it? Can you explain the meaning of "attribute"?How does sia look like on an ER chart? Please illustrate with a diagram.arrow_forwardExplain ENTITY EXTRACTION AND ER DIAGRAMarrow_forward
- Draw an ER diagram for the following scenario- • An instructor has an ID, a name, and a phone number. An instructor teaches a course • A course has a code, course name, credits, and an instructor. Each course uses a textbook. • A textbook has ISBN, name, publisher, editor, and authors. Your ER diagram should have entities, attributes, composite attribute, multivalued attribute, key attributes, binary relationships, and a total participation. Explain your rationale behind each design choice. Please draw the ER diagram on paper showing all seperate parts for each instructor, course and textbook. Showing each connection seperately and explaining which connection is whicharrow_forwardDiscuss how traceability relations are classified, elicit a brief example that defines the classification context, and draw a diagram if necessary.arrow_forwardList the Entity-Relationship (ER) model's various characteristics.arrow_forward
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