Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Expert Solution & Answer
Chapter 6, Problem 10RQ
Explanation of Solution
Anomaly:
- Without normalization, redundancies occur in the table, and it may lead to errors or some sort of inconsistency. These are termed as anomalies.
- Anomalies occur when user wants to update the data in the table.
- There are three types of anomalies. They are,
- Insertion anomaly
- Deletion anomaly
- Modification anomaly
Insertion anomaly:
- Certain attributes cannot be inserted in the
database table without the presence of other attributes and causes the occurrence of insert anomaly. - For example,
- Suppose a student data need to be inserted in the STUDENT database table.
- Student_name and dept are the combination of primary keys in the STUDENT relation.
- The user must enter the values for both the keys. But, this is an anomaly here, because the user can enter only Student_name; the value for dept is unknown to the user until the student joins the department.
Deletion anomaly:
- Deletion of an attribute causes unintended loss of data or inconsistencies in the database and is referred to as deletion anomaly...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What three data anomalies are caused by data redundancy? How to eliminate such anomalies
Chapter 6 Solutions
Database Systems: Design, Implementation, & Management
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Discuss the problems that can be caused by data redundancy.arrow_forwardWhat is meant by data archiving? Why is this an important consideration when operating a database?arrow_forwardIn the hierarchy of data, what is the difference between a data attribute and a data item? What is the domain of an attribute?arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781305627482Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningPrinciples of Information Systems (MindTap Course...Computer ScienceISBN:9781305971776Author:Ralph Stair, George ReynoldsPublisher:Cengage Learning
- Principles of Information Systems (MindTap Course...Computer ScienceISBN:9781285867168Author:Ralph Stair, George ReynoldsPublisher:Cengage LearningFundamentals of Information SystemsComputer ScienceISBN:9781337097536Author:Ralph Stair, George ReynoldsPublisher:Cengage LearningCOMPREHENSIVE MICROSOFT OFFICE 365 EXCEComputer ScienceISBN:9780357392676Author:FREUND, StevenPublisher:CENGAGE L
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Principles of Information Systems (MindTap Course...
Computer Science
ISBN:9781305971776
Author:Ralph Stair, George Reynolds
Publisher:Cengage Learning
Principles of Information Systems (MindTap Course...
Computer Science
ISBN:9781285867168
Author:Ralph Stair, George Reynolds
Publisher:Cengage Learning
Fundamentals of Information Systems
Computer Science
ISBN:9781337097536
Author:Ralph Stair, George Reynolds
Publisher:Cengage Learning
COMPREHENSIVE MICROSOFT OFFICE 365 EXCE
Computer Science
ISBN:9780357392676
Author:FREUND, Steven
Publisher:CENGAGE L