Learn SQL
Interactive Online Course

Master SQL with hands-on exercises that mirror real work — write queries in your browser and prep for tech interviews

315K+

more than 315K satisfied users

Step-by-Step SQL Tutorial

Interactive lessons that walk you from SELECT to JOIN with hands-on practice

SQL Practice Tasks

130+ SQL exercises and real interview questions from top tech companies

Who Should Learn SQL

For Analysts

Deepen your knowledge in your field and acquire the necessary skills for productive work

For Developers

Learn to work optimally with relational databases

For Testers

Improve the quality of database testing and learn to automate testing processes

For Students

Master the basics of working with databases and gain practical skills that will be useful in your future career

With us you study at a convenient time for you and at a pace convenient for you

With us you will go through more than 60 topics and complete more than 70 tasks to reinforce the theory

Module 0

Introduction

In this short module, we'll take a look at how this course's platform works and learn how to get the most out of it. And also get information about our community.

Introduction

Course structure

Community

Module 1

Fundamentals

This module is designed to give you a basic understanding of databases and fill in potential gaps. Also in this module, we will get acquainted with the terminology of relational DBMS.

Document-oriented databases

Structure of relational databases

Introduction to SQL

Module 2

Basis of selection I

In this module we will learn how to write our first SQL queries, deal with such important concepts as conditional selection, sorting and data grouping.

Basic SQL Query Syntax

Literals

Function usage

Duplicate elimination, DISTINCT

Conditional WHERE operator

Operators IS NULL, BETWEEN, IN

Operator LIKE

Regular expressions

Sorting, ORDER BY operator

Grouping, GROUP BY operator

Aggregate functions

Operator HAVING

ready to level up?

For those already fluent in SQL

Once the free course clicks, you write SQL with confidence. Where to go next is up to you — some head into performance, others into analytics, others into data architecture. We have an advanced course for each track — deep dives on real-world tasks.

SQL Query Optimization in PostgreSQL

Premium

PostgreSQL

10 hours

Stop guessing why your queries are slow. Learn to read EXPLAIN, pick indexes for specific tasks, and speed up queries by 100x+ on real production cases.

Close 'this query is slow' tickets yourself — via EXPLAIN, indexes, statistics
Cut latency on slow production queries by 10–100×
Explain to your team why the planner picked this plan

Start learning

SQL for Data Analysis

Premium

MySQL

PostgreSQL

15 hours

Learn to answer product questions right in the database — no dumping into Python or BI tools. You'll master pivot tables, time series analysis, retention, funnels, and user segmentation — all in pure SQL.

Answer product questions in Slack in minutes, not days
Build cohorts, funnels, and retention in pure SQL — no Python exports
Stop hitting the GROUP BY ceiling — windows and time series handle 80% of cases

Start learning

DB Design and Architecture

Premium

PostgreSQL

15 hours

From the first table to a live system under load. Learn not to memorize answers but to spot the forks: which key, which type, which lock, how to migrate the schema without taking prod down.

Design schemas that won't be rewritten in a year under load
Implement tricky cases — history, hierarchies, JSONB — without code-side hacks
Ship migrations on big tables without 'we'll need a one-hour outage'

Start learning

All courses are included inPremium— along with AI hints, certificates, and everything else.

We truly have an interactive course, making learning more effective

Practice SQL with Real-World Tasks

Go to Simulator

Over 100 tasks close to real-life scenarios

Tasks are divided into several levels of difficulty

All your progress is saved

SQL Interview Questions from Top Companies

Test SQL assignment from an interview at TikTok

Earn a Verifiable SQL Certificate

Increase your chances of landing a job with a SQL certificate you can share on LinkedIn and your résumé

SQL Academy course completion certificate

Our Users Love Us

Anna

After completing the course, I got promoted to data analyst. The course paid for itself in just one working day with my new salary!

Ruslan

I was looking for interactive resources and found SQL Academy. This resource is 95% free, but the main thing is the quality of the material. Written in accessible language, understandable even for beginners.

Olya

I thought SQL was overly complicated. But in SQL Academy everything is explained in detail! Excellent trainer with tasks of varying difficulty. You can complete it absolutely for free!

Lev

Great interactive textbook for learning SQL basics. Will definitely continue learning on this platform.

Liza

The site is great! Tasks are interesting, UX is at a high level! Verification based on query results, not the query itself like on other sites.

Nikolay

Excellent presentation of the material! Very pleased with tasks from interviews at large IT companies.

Evgeny

Everything is very accessible and concise, I'm wildly excited! You can't think of anything better!

FAQ

Why choose our courses?

We provide most of our functionality for free, so you can start learning without any investment and decide later if you want to get full access.
Our courses include many practical tasks, which help to consolidate the acquired knowledge in practice.
Affordable cost. We don't spend money on marketing, which allows us to keep prices loyal.

How much time should I dedicate to studying?

It's up to you. You can learn at your own pace. By dedicating 5 hours a week, you can complete the course in 2 months. With intensive training, you can complete the program and receive a certificate in just 2 weeks.

When can I start learning?

Our courses are self-paced, so you can start learning at any time.

Still have questions?

If you didn't find the answer to your question, you can ask it at feedback@sql-academy.org

Learn SQL Interactive Online Course

Step-by-Step SQL Tutorial

SQL Practice Tasks

Who Should Learn SQL

For those already fluent in SQL

Practice SQL with Real-World Tasks

SQL Interview Questions from Top Companies

Earn a Verifiable SQL Certificate

Learn SQL
Interactive Online Course