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QueryCraft SQL
Learn SQL by writing real queries.
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Free interactive SQL course
Learn SQL by writing real queries.
QueryCraft SQL is a free, practical SQL course for beginners and refreshers. Practice SQL online free with checked exercises, hints, answer review, exams, and one consistent training database.
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GreenCart query
checked
SELECT c.customer_name, SUM(oi.quantity * oi.unit_price) AS revenue FROM customers c JOIN orders o ON o.customer_id = c.customer_id JOIN order_items oi ON oi.order_id = o.order_id GROUP BY c.customer_name ORDER BY revenue DESC;
Correct. 8 rows returned.
Why QueryCraft SQL
Built for free SQL practice, not passive reading
Beginner-friendly lessons
Start from database foundations, then build toward real reporting, joins, subqueries, and data-change workflows.
SQL exercises with answers
Run real queries, get result-based feedback, use hints, and review a correct answer with an explanation when you get stuck.
Course-wide schema
The GreenCart database stays consistent so learners build fluency instead of relearning toy tables.
Exams and progress
Module exams, a final exam, mistakes review, and cloud progress are designed for serious learning.
What you can do here
Free SQL learning for common goals
Learn SQL from scratch
Start with beginner SQL concepts like tables, rows, columns, SELECT, WHERE, sorting, and result sets.
Practice SQL online
Use the browser-based practice flow and SQL sandbox without installing a database locally.
Prepare for interviews
Build confidence with query-writing practice, exams, and daily challenge questions that mirror practical assessment skills.
Refresh analyst skills
Review joins, GROUP BY, aggregate functions, data quality checks, and reporting-style SQL patterns.
Course schema
One realistic database across the course
customers
orders
order_items
products
payments
reviews
The full schema includes hubs, neighborhoods, customers, staff, suppliers, categories, products, inventory, promotions, orders, order items, payments, deliveries, reviews, and support tickets.
Common questions
Free SQL learning that still feels practical
Is QueryCraft SQL free?
Yes. The SQL course, practice exercises, SQL sandbox, and daily challenge are free to use. Signing in only helps save progress and tokens.
Can beginners learn SQL here?
Yes. The course starts with tables, rows, columns, SELECT, and WHERE before moving into joins, GROUP BY, aggregation, subqueries, and data changes.
Is it useful as a SQL refresher?
Yes. Experienced users can jump into practice, Daily Challenge, exams, or the SQL sandbox to refresh query-writing fluency.
Do exercises run real SQL?
Yes. QueryCraft checks your SQL against a realistic GreenCart database and compares the returned columns, rows, and query behavior.
Ready to write your next SQL query?
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