Interactive SQL practice
Practice SQL online with real queries—not passive tutorials.
Solve 300 hands-on SQL exercises in your browser. Read the schema, write the query, run it against a prepared dataset, and get immediate result validation.
Free to start. No credit card required.
SELECT
department_id,
COUNT(*) AS employee_count
FROM employees
GROUP BY department_id
ORDER BY employee_count DESC;Write and run SQL
Use the integrated editor instead of copying finished answers.
Work with real datasets
Inspect schemas and sample rows before building your query.
Get immediate feedback
Validate the returned columns, rows, values, and ordering.
Structured progression
Build skill in the right order
Core contains 250 exercises for durable foundations. Advanced SQL adds 50 Pro challenges for multi-step analytical and interview-level reasoning. Progress remains separate for each track.
SELECT & filtering
Build reliable foundations with SELECT, WHERE, NULL handling, sorting, and limits.
JOIN practice
Work through INNER JOIN, LEFT JOIN, multi-table relationships, and missing matches.
GROUP BY & analytics
Calculate business metrics with aggregates, HAVING, conditional logic, and grouped results.
Window functions
Practice ranking, running totals, LAG, LEAD, partitions, and deterministic ordering.
SQL practice questions
Start with syntax fundamentals, then learn to reason about joins, data grain, dates, rankings, and business metrics.
Can I practice SQL online without installing a database?
Yes. SQL Master provides a browser-based SQL editor and prepared datasets, so you can write and run queries without installing a local database.
Which SQL topics can I practice?
The library covers SELECT, WHERE, JOINs, GROUP BY, HAVING, subqueries, CTEs, date logic, window functions, data quality, and advanced business analytics.
Is SQL Master suitable for interview preparation?
Yes. Questions progress from fundamentals to multi-step analytical and interview-level SQL, with an Interview Simulator available for timed practice.
How should a beginner practice SQL?
Start with Core SELECT and filtering questions, run every query yourself, inspect incorrect results, then progress to aggregation, JOINs, subqueries, CTEs, and window functions.