Explain how 2NF and 3NF vary from their general definitions in their essential notions. Demonstrate.
Explain how 2NF and 3NF vary from their general definitions in their essential notions. Demonstrate.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Explain how 2NF and 3NF vary from their general definitions in their essential notions. Demonstrate.
Expert Solution
Step 1
2NF: This specifies a relation that is in first normal form, and it should not have any non-prime attribute that is functionally reliant on any suitable subset of any candidate.
Moreover, it should not have any non-prime attribute that is functionally dependent on any candidate.
It is a database design that must fulfil the third normal form and decreases the duplication of data, avoids data anomalies, and simplifies the administration of data.
In addition, it satisfies all of the requirements of the second normal form.
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