SQL Test Online: Practice SQL Queries and Test Your Skills
SQLTest.online is a free online SQL tester and trainer. Write real queries in the browser, run them against real databases and get instant feedback from automatic tests. Use it to learn SQL from scratch, keep your skills sharp for work, or prepare for a technical interview.
Our motto: Master SQL — one query at a time.
How the SQL Tester Works
The question bank holds 460 practice tasks, from basic SELECT queries to analytical problems with window functions and CTEs.
Tasks are organized by topic, difficulty and database engine.
Each task has automated tests: your query runs on the real database, and the result is compared with the expected one, together with task-specific conditions.
Choose an SQL task
Browse exercises by topic, difficulty, or database.
Write your query
Use the built-in SQL editor right in the browser.
Run, test, and improve
Get instant feedback and refine your query until all tests pass.
Practice SQL on Real Databases
Tasks run on real database engines, so you learn the SQL dialect you will meet at work:
- Sakila on MySQL: a DVD rental store, the classic database for learning SQL;
- Bookings on PostgreSQL: flights, tickets and seats;
- AdventureWorks on SQL Server: sales and products of a bike company;
- Employee on Firebird, University on MariaDB, Querynomicon on SQLite, NYC Yellow Taxi on DuckDB and Countries on PostGIS.
To try your own queries without a task, open the SQL playground: an online SQL editor for MySQL, MariaDB, PostgreSQL, SQL Server, Oracle, SQLite and Firebird.
Take the SQL Skills Test
The SQL skills test is a free online SQL assessment: 12 practical tasks of different difficulty, randomly picked from the question bank, and three hours to solve them. Sign in to take it. Depending on the result you get a rank: Intern, Junior, Middle or Senior. It is not an official certificate, but it shows how well you write SQL in practice.
Learn SQL with Free Lessons
If you are new to SQL, start with the SQL lessons: from SELECT and WHERE to joins, subqueries, window functions and query optimization. Every lesson has examples you can run and links to practice tasks on the same topic.
Prepare for an SQL Interview
The SQL interview simulator asks questions for the position and level you choose and checks your answers, just like a technical interview.
No Account Required
You can start solving SQL tasks right away without creating an account. Signing in is optional, but it lets you:
- save your progress and come back to tasks anytime;
- earn achievements and track your statistics;
- compare your solution with other users' solutions after you solve a task.
Quick SQL Learning Tips
- Try several approaches: different SQL solutions can perform very differently.
- Read the task conditions carefully: some tasks require a specific statement or result format.
- Use the estimated query cost (when available) to learn optimization, but focus on correctness first.
Frequently Asked Questions
Is SQLTest.online free?
Yes. All practice tasks, lessons, the SQL playground and the SQL skills test are free. You can solve tasks without registration; the skills test needs a free account. Some AI features have a free daily limit.
How can I test my SQL skills online?
Take the free SQL skills test: 12 practical tasks with automatic checking and three hours to solve them. At the end you get a rank from Intern to Senior that shows your level.
Which databases can I practice SQL on?
Tasks run on MySQL, PostgreSQL, SQL Server, MariaDB, SQLite, Firebird, DuckDB and PostGIS. The SQL playground also supports Oracle.
Is SQLTest.online good for SQL interview preparation?
Yes. Practice tasks cover the topics interviewers ask about most often, from joins and grouping to window functions, and the interview simulator lets you rehearse a technical SQL interview.
Community and Support
Join the SQLTest learning community in our English-speaking chats on Telegram or WhatsApp to ask questions, share ideas, and improve your SQL skills together.
If you need help, have feedback, or want to report an issue, email us at support@sqltest.online.