Forget boring lectures. SQL Boy is your interactive playground to learn, practice, and master database skills directly in your browser.
Our comprehensive platform combines interactive tutorials, powerful developer tools, and visual learning aids to help you master SQL from basics to advanced concepts.
Learn SQL through 15 hands-on lessons covering SELECT statements, JOINs, aggregations, subqueries, and window functions. Each lesson includes real-time validation and instant feedback to help you learn faster and retain knowledge better.
Start LearningUnderstand complex SQL concepts with interactive visualizations. See how queries are parsed with AST views, explore execution plans, and watch animated JOIN operations. Visual learning makes difficult concepts easier to grasp and remember.
Explore VisualsProfessional SQL tools for everyday development work. Format queries for readability, minify SQL for production, and validate syntax across multiple database dialects including MySQL, PostgreSQL, SQLite, and MariaDB.
Try ToolsFrom your first SELECT statement to complex window functions, our curriculum guides you through every concept with interactive exercises and real-world examples.
Master the basics: SELECT, WHERE, operators, and sorting results.
5 LessonsLearn to summarize data with COUNT, SUM, GROUP BY and HAVING.
4 LessonsConnect data from multiple tables using INNER, LEFT, and CROSS JOINs.
6 LessonsLevel up with Subqueries, CTEs, and Window Functions.
5 Lessonsplus dedicated tracks for...
Consistency is key to mastery. Every day, we present a new bite-sized SQL problem based on real interview questions from top tech companies.
Write a query to identify all customers who have placed more than 3 orders in the current month...
Stop guessing. Practice with real-world SQL interview questions from the industry's toughest hiring bars. From Airbnb's pricing logic to Meta's engagement metrics.
SQL Boy utilizes a unique hybrid architecture that gives you the best of both worlds: the privacy and speed of local execution, combined with the convenience of cloud synchronization.
Your SQL queries never leave your device. We use WebAssembly (WASM) to run a full SQLite engine directly in your browser. This guarantees that your practice data and query logic remain completely private.
Create an account to synchronize your learning journey. Your completed lessons, badges, and daily challenge streaks are securely stored in the cloud, allowing you to switch devices without losing your momentum.
We only store what's necessary to track your progress. We do not inspect, log, or store the specific SQL queries you write in the playground. Your code is yours alone.
Traditional online SQL editors fall into two traps: they either send every keystroke to a server (privacy risk & latency), or they are purely local but forget who you are once you close the tab.
SQL Boy solves this. By decoupling execution from progress tracking, we ensure:
Yes! The core learning experience, including all tutorials, the playground, and local practice, is 100% free. We believe quality education should be accessible to everyone.
No. SQL Boy runs entirely in your web browser. You don't need to install MySQL, PostgreSQL, or any other software. We use a powerful WASM-based SQLite engine that runs right in your browser tab.
Absolutely. You can upload your own CSV or JSON files to the playground. Since processing happens locally, your private data never leaves your computer.
LeetCode focuses on assessment and algorithmic puzzles. SQL Boy is designed for *learning*. We provide interactive lessons, visualizations of how queries work (like animated joins), and a sandbox environment for exploration, not just pass/fail tests.
We currently use SQLite, which is the most widely deployed database engine in the world. The syntax is very similar to PostgreSQL and MySQL, so everything you learn here applies to other major databases.
Join thousands of learners who have improved their SQL skills with our interactive platform. Start your journey today - it's completely free!
Begin Your SQL Journey