Start with our HR schema, which has 25 beginner-friendly questions. Begin with basic SELECT statements, then progress through WHERE clauses, JOINs, and aggregate functions. Our interactive editor provides immediate feedback to help you learn faster.

We offer five realistic database schemas: HR Management (25 questions), E-commerce Platform (19 questions), School System (15 questions), Healthcare (15 questions), and Banking (15 questions). Each schema includes realistic sample data and covers different SQL concepts from basic to advanced levels.

No installation required! Our platform runs entirely in your browser using SQLite. You get a professional Monaco editor (VS Code engine) with syntax highlighting, autocomplete, and real-time error checking.

Questions are categorized as Easy, Medium, and Hard. Start with Easy questions to build fundamentals, then progress to Medium for complex JOINs and aggregations, and finally Hard questions for advanced topics like window functions and CTEs.

Yes! Your progress is automatically saved in your browser. Track completed exercises, view attempt counts, and resume exactly where you left off. Each schema maintains separate progress tracking.

Our comprehensive curriculum covers: Basic SELECT, WHERE, ORDER BY, Aggregate functions (COUNT, SUM, AVG), GROUP BY and HAVING, All types of JOINs, Subqueries, Window functions, Date/time functions, String manipulation, and Advanced topics like CTEs.

Practice with our interview-focused questions and work through real company case studies (Netflix, Uber, Discord, Airbnb). Focus on explaining your thought process, not just getting the right answer.

HR schema focuses on employee data and relationships. E-commerce covers customers, orders, and products. School system includes students, courses, and enrollments. Healthcare covers patients, doctors, appointments, and diagnoses. Banking covers branches, customers, accounts, and transactions. Each teaches different real-world SQL scenarios.

Yes, but viewing the solution marks the question as 'Skipped' rather than 'Completed'. Only self-solved questions count as completed. You can always reset and try again to achieve completed status.

Each question shows the expected query results in real-time. When you run your query, we automatically compare your results with the expected output and provide instant feedback on correctness.

We support standard SQL syntax including SELECT, INSERT, UPDATE, DELETE, JOINs, subqueries, aggregate functions, window functions, CASE statements, date functions, string functions, and most SQLite-compatible syntax.

Absolutely! Our Hard difficulty questions cover advanced topics like recursive CTEs, complex window functions, advanced JOINs, performance optimization, and real-world data analysis scenarios used by top tech companies.

We regularly add new questions and update existing ones. Our goal is to maintain the most current and relevant SQL practice platform with real industry examples.

Our platform uses SQLite syntax, which is highly compatible with PostgreSQL, MySQL, and SQL Server. The concepts and queries you learn here transfer directly to all major database systems.

We offer real-time query execution, automatic answer validation, realistic database schemas, progress tracking, no registration requirements, and content based on actual interview questions from top tech companies.