Answered: Define second normal form. What types…

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

Define second normal form. What types of problems might you encounter using tables that are not in second normal form?

Expert Solution

Step 1

Database Normalization :

In database normalization data is represented in terms of relations that are in the standard normal form and it is a design technique that reduces data redundancy as well as eliminates undesirable characteristics.

1NF (First Normal Form) :

The first Normal form is considered as a basic requirement of the database.

Rules :

Each table should contain a single value attributes or column.
Each record in a table needs to be unique.

2NF(Second Normal Form) :

A table is in second normal form if and only if it is in first normal form and it should not have a partial dependency.

Rules :

A table in first normal form.
it has a single-column primary key.

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