Practice SQL with hands-on exercises in your browser. Write real queries against a live database, get instant feedback, and build confidence through guided challenges. No setup required - start coding immediately.
Interactive SQL Practice is a free, hands-on course designed for beginners who want to build real SQL skills by writing actual queries in the browser. Starting from simple SELECT statements and column aliases, you progress through filtering rows with WHERE conditions, sorting results with ORDER BY, and paginating output with LIMIT and OFFSET. Every lesson runs against a live in-browser database, so you get instant feedback without installing anything on your computer.
The course then moves into aggregate functions like COUNT, SUM, AVG, MIN, and MAX, showing you how to group and summarize data with GROUP BY and HAVING. You will also practice joining multiple tables together using INNER JOIN and LEFT JOIN, which is the skill most beginners find hardest and most valuable. The final modules cover data modification (INSERT, UPDATE, DELETE) and a tiered set of challenge exercises that test everything you have learned.
This course suits students, analysts, and anyone who works with data and wants to move beyond spreadsheets. Whether you are preparing for a database course, a job that requires querying data, or just curious about how applications store and retrieve information, completing the lessons and passing the final exam earns you a certificate of completion you can add to your LinkedIn profile or resume.
7 modules • 27 lessons
The course covers seven modules: selecting and aliasing columns, filtering with WHERE and LIKE, sorting and limiting results, aggregate functions with GROUP BY and HAVING, joining multiple tables, and modifying data with INSERT, UPDATE, and DELETE. It closes with beginner, intermediate, and advanced challenge exercises so you can test your full skill set.
Yes, the entire course is free. You can work through every lesson and challenge without creating an account, and finishing the course plus the final exam earns a certificate of completion at no cost.
No prior experience is required. The course is rated beginner and assumes you have never written a SQL query before. The first module introduces the in-browser playground and walks you through your very first SELECT statement step by step.
Nothing to install. The course runs entirely in your browser against a live database, so you can start writing real queries immediately from any device with an internet connection.
Yes. Completing the course lessons and passing the final exam earns a certificate of completion that you can share on LinkedIn or add to your resume to show employers or academic programs that you have practical SQL skills.
Learn JavaScript programming with hands-on exercises. Practice variables, functions, arrays, objects, and more with live code execution in your browser. Master modern ES6+ features like arrow functions, destructuring, and spread operators.
Learn Python programming with hands-on exercises. Practice variables, data types, functions, loops, and more with live code execution in your browser. No installation required - powered by Pyodide.
Master TypeScript with hands-on exercises. Learn types, interfaces, generics, utility types, and advanced patterns with live code execution. Build type-safe applications with instant feedback in your browser.
Master bash scripting through hands-on practice. Build on your Linux command line skills to write powerful automation scripts. Learn variables, conditionals, loops, functions, arrays, string manipulation, file processing, and error handling with interactive exercises in your browser.
Master server-side JavaScript with Node.js through hands-on practice. Learn modules, file system operations, HTTP servers, npm, async patterns, and REST APIs. Build real backend applications with interactive exercises in your browser.
Master the fundamentals of SQL from scratch. Learn to query, manipulate, and design databases using PostgreSQL. Build real-world database systems through hands-on exercises and a capstone project. No prior database experience required.