Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 4, Problem 4.8RQ
Explain the difference between an entity class and an entity instance.
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Chapter 4 Solutions
Database Concepts (7th 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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- Explain the difference between a relationship class and a relationship instance.arrow_forwardGive some special guidelines for naming entity typesarrow_forwardCreate a base class called Entity. The Entity class must hold the common attributes and behaviors from UML. Entity Class UML Entity -id: long -name: String -------------------------------- -Enity() +Entity(id: long, name: String) +getId(): long +getName(); String +toString(): String Complete the code for the Player and Team classes. Each class must derive from the Entity class. Refactor the Game class to inherit from this new Entity class. Every team and player must have a unique name by searching for the supplied name prior to adding the new instance. Use the iterator pattern in the addTeam() and addPlayer() methods. Code that I have, not sure if I have it correct. Thank you Entity Class package com.gamingroom; public class Entity {//Private attributesprivate long id;private String name;//Default constructorpublic Entity() { }//Constructor with an identifier and namepublic Entity(long id, String name) {this();this.id = id;this.name = name;} //@return the idpublic long getId() {return…arrow_forward
- Describe the relationships between items and how inheritance works.arrow_forwardCreate an Entity-Relationship model for the following descriptions: Doctors, nurses, and patients have the following unique numbers respectively: doctorNo, nurseNo, and patientNo.arrow_forwardWhat is the relationship between Student and Schedule? A.- Dependency B - Generalization(Inheritance) C - Association D - Composition E - Aggregation F - No relationship existsarrow_forward
- Examine the following entity relationship diagram, and select all statements that correctly describe this diagram. PHOTOGRAPHER PK PHOTOGRAPHER ID FIRST_NAME LAST_NAME ++ uses PK +PK,FK1 CAMERA MODEL NR PHOTOGRAPHER ID DESCRIPTION a. The CAMERA entity has a composite primary key. Ob. The existence of each CAMERA instance depends upon the existence of a PHOTOGRAPHER instance. c. Each CAMERA instance is associated with exactly one PHOTOGRAPHER instance. d. A PHOTOGRAPHER uses one or more CAMERAS. e. Both PHOTOGRAPHER and CAMERA are strong entities.arrow_forwardWhat's the difference between weak and strong entity sets?arrow_forwardProblem You want to create a new kind of instance attribute type with some extra functionality, such as type checking.arrow_forward
- What is the relationship between Student and Course? A.- Dependency B - Generalization(Inheritance) C - Association D - Composition E - Aggregation F - No relationship existsarrow_forwardCourse: Database Systems: Design and Application Web Shop scenario: A supplier (Supp-#) processes many purchase orders (PO-#) and sells a number of products (Prod-#). A product is sold by only one supplier. Each of the purchase orders that a supplier may process includes several products. The relationship between order and product is defined as "Line Item". A customer (Cust-#) may place one or more purchase orders. A purchase order may be placed by only one customer. Assignment requirements: Answer the following questions using above scenario: Identify the entities and attributes that required to draw the ER diagram. Integrate the entities with appropriate relationship and design the unified ER model.arrow_forwardThere are several factors to take into account while discussing attribute inheritance.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