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 4.13RQ
Explanation of Solution
Relationship:
An association between several entities is termed as relationship.
- It is used to link the attributes in entities.
- It is represented in a “diamond” box with name of the relationship in Entity-Relationship diagram.
The following diagram demonstrates the “relationship” among entities.
Difference between relationship class and relationship instance:
| Relationship class | Relationship instance |
| It is a relation between one with other entities (or) entity classes... |
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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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Similar questions
- Select the class relationship that best describes the following scenario: Class A can has a method that has no parameters. This method modifies an attribute of itself. Association (Reflexive) Association (Bidirectional) Association (Directed A to B) Association (Directed B to A) Composition (A as the whole and B as the part) Composition (B as the whole and A as the part) Aggregation (A as the whole and B as the part) Aggregation (B as the whole and A as the part) O Inheritance None of the givenarrow_forwardHow objects of a class are created if no constructor is defined in the class?arrow_forward7- A course has many lectures. Each lecture has a start time and a class number.What should be the relation between the Course class and the Lecture class?a) The Lecture class should be a subclass of the Course class.b) The Course class should be a subclass of the Lecture class.c) The Course class should have a Lecture variable.arrow_forward
- Define Object .arrow_forwardThe technique of packaging an objects attributes into a cohesive unit that can be used as an undivided entity is ____________. a. inheritance b. encapsulation c. polymorphism d. interfacingarrow_forwardDifferentiate between static and instance class members. Explain with proper example when you should make members static?arrow_forward
- Instructions: Create a UML diagram for a Dog class. You can get some useful information from your book Review Chapter 5 Pg. 179-180. CLASS NAME List the instance variables in the constructor. Unified Modeling Language (UML) List the methods in the class. o - indicates private o name is the variable name o string is the data type of name CLASS NAME List the instance variables in the constructor. o + indicates public o getName is the method name o o string is the return data type List the methods in the class. The second row of the UML diagram lists the instance variables in the constructor. For example -name: string Java.util. The third row of the diagram lists the methods in the class. For example, +getName(): string empty parenthesie indicate nothing is sent to the method.arrow_forwardWhat's the difference between a class's static and non-static data members? Give an example of why a static data member might be helpful in the real world.arrow_forwardDescribe how method overriding is used in the context of inheritance and base classes in object-oriented programming.arrow_forward
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