course content

Course Content

Relational Database and Normalization

Second Normal FormSecond Normal Form

The Second Normal Form Rules:

  • Requires the First Normal Form.
  • The data that repeatedly appear in several rows should be presented in separate tables.

Look at the example:

Here we can see that John, Ivan, and Platon work in one company named Good Job Corporation.

So, let's normalize it! The second normal form:

Now the database has not a duplicate of information about the country of the company. Now it takes up less memory.

Summary. Second Normal Form

Takes up less memory
Improves the structure of the database


What mean the Second Normal Form?

Select a few correct answers

Section 3.

Chapter 3