Using MIS (9th Edition)
Using MIS (9th Edition)
9th Edition
ISBN: 9780134106786
Author: David M. Kroenke, Randall J. Boyle
Publisher: PEARSON
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Chapter 5, Problem 5.1UYK
Program Plan Intro

E-R model:

  • It is a tool for creating data model.
  • It is used for developers to describe the content of data model by using two functions called entities and relationships.

Entity:

  • It helps the user for tracking something in database.
  • Example entities in student database system are Student, Grade, Course, etc.

Relationships:

  • Entities have relationships among each other.
  • For example, in student database, a Student has a relationship to Major and Student has a relationship to Advisor.

Attribute:

  • It used to describe the entity characteristics.
  • Example attributes of student entity is Student_id, Student_name, Student_address, etc.

Identifier:

  • It is an attribute or group of attribute, but its value is related with one and only one entity instance.

Example of E-R diagram:

Using MIS (9th Edition), Chapter 5, Problem 5.1UYK , additional homework tip  1

Expert Solution & Answer
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Explanation of Solution

Entity Relationship diagram that displays relationship among the database, database application and users:

The below is the E-R diagram that shows the relationship that is laid among the database, database application and users:

Using MIS (9th Edition), Chapter 5, Problem 5.1UYK , additional homework tip  2

User:

The person or end user that can process the application that is stored in the database.

Database application:

A database application is a collection of four elements namely forms, reports, queries and application which acts as an intermediate between the user and data of the database

Database:

Database is a collection of information that is used to store and retrieve the data. Data is organized in tables.

Explanation of the E-R diagram:

  • Many user can use the database application.
    • Example of the user entity could be “students”, “faculty”.
  • Many database applications can be present in a single database.
    • Example of the database application could be “Bookstore”,”Library”.
  • Only one database can contain many database application.
    • Example of the database could be “studentDB”,”BookStoreDB”.
  • The relationship between the user and the database application is “M:N (Many to many )relationship.
  • The relationship between the database application and theDatbase is “N:1”(Many to One) relationship.

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