Gain insights into fundamental database concepts, relational databases, and entity-relationship diagrams. Learn about normalization techniques and basics of SQL to enhance database efficiency.

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

SELECT PROJECT, COUNT(Emp_Id) AS Emp_Count 
FROM SALARY 
GROUP BY PROJECT 
ORDER BY Emp_Count DESC;

Again, the solution will work without using the alias for `COUNT(Emp_Id)`.

## Explanation

The query has two requirements: first, fetch the project-wise count and then sort the result by that count. For a project-wise count, we will be using the COUNT() function to count the number of employees that have been grouped together using the GROUP BY clause. Lastly, for sorting, we will use the ORDER BY clause on the alias of the employee-count.

The slides below help to visualize the solution:

Again, the solution will work without using the alias for `COUNT(Emp_Id)`.

# Explanation

The query has two requirements: first, fetch the project-wise count and then sort the result by that count. For a project-wise count, we will be using the COUNT() function to count the number of employees that have been grouped together using the GROUP BY clause. Lastly, for sorting, we will use the ORDER BY clause on the alias of the employee-count.

The slides below help to visualize the solution:

Introduction

Fundamental Concepts

Data Modeling

Entity-Relationship Data Model

The Relational Data Model

Functional Dependencies

Normalization

Structured Query Language

Conclusion

Solution to Exercise 3

Solution