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

## Dependency diagrams

A dependency diagram illustrates the various dependencies that might exist in a **non-normalized** table. A non-normalized table is one that has data redundancy in it. This is illustrated below:

# Dependency diagrams

A dependency diagram illustrates the various dependencies that might exist in a **non-normalized** table. A non-normalized table is one that has data redundancy in it. This is illustrated below:

In this lesson, we will look at the diagrammatic representation of functional dependencies.

Introduction

Fundamental Concepts

Data Modeling

Entity-Relationship Data Model

The Relational Data Model

Functional Dependencies

Normalization

Structured Query Language

Conclusion

Dependency Diagrams

Dependency diagrams