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 5.8, Problem 5ARQ

Explanation of Solution

Criticality of User involvement during database development:

  • The database design that depends completely on user views their business environment.
  • For example, consider “Student”database, contains a list of possible data such as “Classes”, “Students”, “Grades”, “Office_Visits”, “Emails”, “Majors”, “Student_Organization”, “Advisor”.
  • The possibilities of the including the data list will be a major concern for the user considering which data to be included and what data should be excluded based on the requirement in performing the required process.
  • The above mentioned list may extend further, but it should include all the necessary data that user want to perform their jobs.

Function of a data models:

The functions of a Data model are:

  • Data
  • Relationships

Data:

  • Data is referred as the collection of information.
  • It helps the user for tracking something in database, is also referred as entity.

Relationship:

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

Database development process:

Definitions:

E-R model:

  • ER model 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:

  • Entity 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:

  • Attribute used to describe the entity characteristics...

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