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 E.FULL_NAME, S.SALARY
FROM EMPLOYEE AS E
INNER JOIN SALARY AS S
ON E.EMP_ID = S.EMP_ID
WHERE S.SALARY >= 40000 AND S.SALARY <= 60000

The solution will also work without using the aliases as seen below:

# Solution #2

SELECT EMPLOYEE.FULL_NAME, SALARY.SALARY
FROM EMPLOYEE
INNER JOIN SALARY
ON EMPLOYEE.EMP_ID = SALARY.EMP_ID
WHERE SALARY.SALARY >= 40000 AND SALARY.SALARY <= 60000

# Explanation

We will perform an INNER JOIN on the two tables to retrieve the common records and then the WHERE clause is used to specify the condition that SALARY has to be in a certain range.

It is important to note that we joined the two tables because part of the information we needed was in the EMPLOYEE table (`Full_Name`) and the other half in the SALARY table (`Salary`).

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 2

Solution #1