Course
Introduction to Relational Databases in SQL
BasicSkill Level
Updated 01/2026Start Course for Free
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SQLProgramming4 hr13 videos45 Exercises3,600 XP180K+Statement of Accomplishment
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Explore the Role of SQL in Relational Database Management
There are a lot of reasons why SQL is the go-to query language for relational database management. The main one is that SQL is a powerful language that can handle large amounts of data in complex ways and solve tricky analytical questions. In this course, you will gain an introduction to relational databases in SQL.Learn how to create tables and specify their relationships, as well as how to enforce data integrity. Additionally, discover other unique features of database systems, such as constraints.
Create Your First Database
You begin the course by creating your first database with simple SQL commands. Next, you’ll learn how to update your database as the structure changes by migrating data and deleting tables.In the final chapter, you will glue tables in foreign keys together and establish relationships that greatly benefit your data quality. Finally, you will run ad hoc analyses on your new database.
Understand the Basics of Relational Databases
By the end of the course, you will gain a basic yet essential understanding of SQL relational databases. They are widely used in various data science fields (from healthcare to finance) and have consequently become one of the crucial languages for data scientists. If you're interested in deepening your knowledge further, you may be interested in our SQL for Database Administrators, SQL Server Developer, and SQL Server for Database Administrators Tracks.Feels like what you want to learn?
Start Course for FreeWhat you'll learn
- Define PostgreSQL data types, NOT NULL, and UNIQUE attribute constraints for column-level consistency enforcement
- Differentiate 1:N and N:M relationships and implement them with foreign keys and junction tables
- Evaluate and use referential integrity actions (NO ACTION, CASCADE, SET NULL, SET DEFAULT) for consistency preservation during data modifications
- Identify advantages of relational databases over flat file storage regarding redundancy reduction and data quality preservation
- Select and apply primary, surrogate, and candidate keys for unique record identification
Prerequisites
Intermediate SQL1
Your first database
In this chapter, you'll create your very first database with a set of simple SQL commands. Next, you'll migrate data from existing flat tables into that database. You'll also learn how meta-information about a database can be queried.
2
Enforce data consistency with attribute constraints
After building a simple database, it's now time to make use of the features. You'll specify data types in columns, enforce column uniqueness, and disallow NULL values in this chapter.
3
Uniquely identify records with key constraints
Now let’s get into the best practices of database engineering. It's time to add primary and foreign keys to the tables. These are two of the most important concepts in databases, and are the building blocks you’ll use to establish relationships between tables.
4
Glue together tables with foreign keys
In the final chapter, you'll leverage foreign keys to connect tables and establish relationships that will greatly benefit your data quality. And you'll run ad hoc analyses on your new database.
Introduction to Relational Databases in SQL
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Enroll NowFAQs
What is a SQL relational database?
Relational databases store data in a multi-dimensional format, whereas SQL is a programming language that primarily deals with relational databases. Because of the relationship between the two, we often refer to the relational database stored in SQL simply as SQL relational database.
Who uses SQL databases?
SQL's comprehensive and powerful abilities attract many companies and organizations that need to store and secure their data. Big companies such as Nike, Microsoft, Dell, and Accenture are among those who use SQL databases.
Will I receive a certificate at the end of the course?
Yes, you would receive a certificate at the end of the course, which you can use to showcase your knowledge of SQL and relational databases.
Who will benefit from this course?
This course is beneficial for anyone who works with databases, such as data analysts, software engineers, database administrators, and more.
What are some of the best practices of database engineering?
Some of the best practices of database engineering include adding primary and foreign keys to the tables, specifying data types in columns, enforcing column uniqueness, and disallowing NULL values.
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