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 4.20RQ
Explain the ambiguity in the definition of the term weak entity. Explain how this book interprets this term.
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List the Entity-Relationship (ER) model's various characteristics.
What does it mean to be a weak entity? Give an illustration.
Explain the ambiguity in the definition of the term weak entity. Explain how this book interprets this term
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
- For each of the following pairs of related entities, indicate whether (under typical circumstances) there is a one-tomany or a many-to-many relationship. Then, using the shorthand notation introduced in the text, draw a diagram for each of the relationships.a. STUDENT and COURSE (students register for courses)b. BOOK and BOOK COPY (books have copies)c. COURSE and SECTION (courses have sections)d. SECTION and ROOM (sections are scheduled in rooms)e. INSTRUCTOR and COURSEarrow_forwardList all of the many properties that the Entity-Relationship (ER) model has.arrow_forwardAnalyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?arrow_forward
- did not answer the question, relationship between the entities(did not show the relationship) and the contraintsarrow_forwardWrite the business rules that are reflected in the ERD shown in Figure P2.15. (Note that the ERD reflects some simplifying assumptions. For example, each book is written by only one author. Also, remember that the ERD is always read from the “1” to the “M” side, regardless of the orientation of the ERD components.) FIGURE P2.15 THE CROW’S FOOT ERD FOR PROBLEM 15arrow_forwardDescribe the Entity-Relationship model and its function.arrow_forward
- Please explain the purpose of the Entity-Relationship model and describe it.arrow_forwardER model relationships are represented using a.) relationship keys b.) primary keys c.) crows foot symbols d.) main keys What do the cardinalities in an ER model show, (please select all that apply)? a.) only a one to one relationship. b.) the minimum number of entities that can be involved in a relationship. c.) only a many to many relationship.arrow_forwardWhat is a weak entity? Give Example.arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY