Learn SQL with our interactive SQL course and unlimited sandbox
The interactive SQL Course of SQL Campus offers short and focused lessons with instant feedback. Practice as much as you like. Everything runs in your browser.

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Learn SQL with results you can see
Write a query and see the answer instantly. Build confidence with interactive exercises, clear examples, and a live results view.
- Master queries, joins, aggregations and more
- Instant feedback on every exercise
- One place for lessons, practice, and progress


Experience SQL Campus with a free demo SQL Course
Explore a sample of the SQL course. Run queries, review the results, and try multiple exercises that build real skill in minutes.
Choose how you want to learn
Pick the path that fits your goal. Start guided lessons, practice freely, or challenge yourself with puzzles.
Guided course
Follow a structured path from fundamentals to real analysis. Every lesson includes multiple exercises with instant feedback so you learn by doing and see clear progress from the first session.
Open sandbox
Jump into a clean workspace and try anything. The sandbox is built for quick experiments in the browser with zero setup and zero pressure.
Unlimited puzzles
Puzzles are generated on the spot so you never run out. Each challenge is unique, checked instantly, and paired with helpful hints and full solutions to build speed and accuracy over time.
Works in your browser
No setup and no downloads. Open SQL Campus on any device, run exercises with instant feedback, and track your progress as you advance.

What you will learn in the SQL Course
A structured SQL course with lessons and multiple exercises in every module. Learn by doing and see results right away.
Query essentials
Learn SELECT, FROM, WHERE, ORDER BY, aliases, and filtering so you can pull exactly the rows and columns you need.
Group and summarize
Use COUNT, SUM, AVG, MIN, MAX with GROUP BY and HAVING to turn raw data into clear summaries.
Combine tables with joins
Write INNER and LEFT joins, handle NULLs, and avoid duplicate rows while answering real questions.
Subqueries and set logic
Use IN, EXISTS, NOT EXISTS, and derived tables to break big problems into readable steps.
Functions and CASE
Transform text, dates, and numbers, and create categories with CASE to express business rules.
Safe data changes
Insert, update, and delete with simple safeguards and checks so you can modify data confidently.
SQL in numbers
Usage, hiring demand, and community scale at a glance.
58.6%
Of developers used SQL this year.
50%
Of data science job ads mention SQL.
674,720+
Questions tagged SQL in the community.
100%
Top four databases rely on SQL.