Database Normalization in Simple English Have you heard of 2NF, 3NF, and BCNF? Do you know what the database normal forms mean? In this article, you will learn database normalization in simple English. With real-world examples, you will better understand what normal forms are, why there are different types, and why we need them. Database courses typically teach database normalization and normal forms abstractly. Functional dependencies and normalization problems are defined using letters (e.
Normalization in Relational Databases: First Normal Form (1NF), Second Normal Form (2NF), and Third Normal Form (3NF)
What is database normalization? What are the different normal forms, and what do they do? Find out in this article. Normalization in relational databases is a design process that minimizes data redundancy and avoids update anomalies. Basically, you want each piece of information to be stored exactly once; if the information changes, you only have to update it in one place. The theory of normal forms gives rigorous meaning to these informal concepts.
The First Normal Form (1NF) is exceptional. The other normal forms (2NF, 3NF, BCNF) talk about functional dependencies and 1NF has nothing to do with functional dependencies. Moreover, we have precise definitions for other normal forms and there is no generally accepted definition of 1NF. Does 1NF Equate to “Atomic Attributes”? When you look at various descriptions of 1NF the word that you see most often is atomic. It is common to say that a relation is in 1NF if all its attributes are atomic.