Databases are universal - they underlie the technology you use every day. They're a crucial component of everything from telecommunications systems, banking systems, and video games to just about any other software system that maintains some amount of persistent data.

In this course, you'll learn about the fundamental concepts of databases, why and when they're used, what relational databases are, and entity-relationship diagrams. You will also be exposed to techniques like normalization that help to increase the efficiency of databases. You'll wrap up with a look at the basics of Structured Query Language (SQL). 

After completing this course, you will be able to move onto more advanced courses involving database systems and SQL.

Database Design Fundamentals for Software Engineers

## Introduction

One important theory developed for the entity relational (ER) model involves the notion of functional dependency (FD).  The aim of studying this is to improve your understanding of relationships among data and to gain enough formalism to assist with practical database design.

A functional dependency is a relationship between two attributes, typically the primary key (PK) and other non-key attributes within a table. For any relation R, attribute Y is functionally dependent on attribute X, if, for every valid instance of X, that value of X uniquely determines the value of Y. This relationship is indicated by the representation below :

# Introduction

One important theory developed for the entity relational (ER) model involves the notion of functional dependency (FD).  The aim of studying this is to improve your understanding of relationships among data and to gain enough formalism to assist with practical database design.

A functional dependency is a relationship between two attributes, typically the primary key (PK) and other non-key attributes within a table. For any relation R, attribute Y is functionally dependent on attribute X, if, for every valid instance of X, that value of X uniquely determines the value of Y. This relationship is indicated by the representation below :

In this lesson, we will discuss the basic concepts of functional dependencies.

Introduction

Fundamental Concepts

Data Modeling

Entity-Relationship Data Model

The Relational Data Model

Functional Dependencies

Normalization

Structured Query Language

Conclusion

Intro to Functional Dependencies

Introduction