Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 5, Problem 5.26RQ
Explanation of Solution
Associative entity:
Associative entity is a used in entity-relationship theory and also in relational
- An entity placed between two entities which has a relationship with these entities.
- Each entity has a “one” connection and the associative entity has “many” connection on each side.
Association entity:
The relationship between two entities is called as association. A pattern of two or more entities are associated to each other by an associative entity.
- The user can turn a many-to-many relationship into an association relationship by including a non-key column to the intersection table.
Example:
Consider an example of association relationship is as follows:
- “Book” and “Author” relationship in N:M is by simply adding a non-key column to the “Intersection_Table”.
- The column name “Book_price” is added to the “Intersection_Table”...
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What is an associative entity (also called an association entity)? What is an association relationship? Give an example of an association relationship other than one shown in this text. Illustrate your answer using an IE Crow’s Foot E-R diagram.
What is entity-relationship diagram (e-r diagram, or erD)?
List the Entity-Relationship (ER) model's various characteristics.
Chapter 5 Solutions
Database Concepts (7th Edition)
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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- Suppose you are working within the framework of the conceptual model in Figure Q4.5. FIGURE Q4.5 THE CONCEPTUAL MODEL FOR QUESTION 5arrow_forwardWhat is the purpose of entity-relationship diagrams? What sort of symbol is used to depict a connection, and how does it work? What exactly does the phrase "associative entity" imply and what does it mean? Give an example.arrow_forwardwhat can be very interesting about the Entity-Relationship (ER) Modeling that people may forget about ( i am not talking about the main function or explication but just a concept/part that people tend to overlook when they study it for the first time?arrow_forward
- Can foreign keys be used with weak entities in an entity relationship diagram??arrow_forwardWhat exactly are entity-relationship diagrams, and how do they come into play? What kind of symbol is utilized to represent a relationship? What is an associative entity, and how does it work? Give an illustration of your point.arrow_forwardDraw an entity-relationship diagram for the following situation:Many students play many different sports. One person, called the head coach, assumes the role of coaching all these sports. Each of the entities has a number and a name. (Make any assumptions necessary to complete a reasonable diagram. List your assumptions.)arrow_forward
- Analyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?arrow_forwardDraw an Entity Relationship Diagram for ther following information.arrow_forwardHow are entity-relationship diagrams used? What kind of symbol is utilized to represent a relationship? What does the term "associative entity" mean? Give an example.arrow_forward
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