Practice problems
Self-paced SQL problems by difficulty, on the Northwind and Dublin Bikes datasets.
SQL practice, labs & exams
Write the query.
Get the verdict.
SQL Judge runs your queries against real datasets, compares the output and scores your work. Practice freely, complete lab manuals and sit proctored lab exams in one place.
- Northwind & Dublin Bikes
- SELECT-only sandbox
- Instant scoring
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Typing…
Waiting for query…
Live demo with sample data.
Everything a SQL course needs
From a first SELECT to a timed lab exam, one platform covers the whole semester.
Instant evaluation
Run a query, inspect the result, then submit for automated scoring against the expected output.
Lab manuals
Self-paced exercises assigned by your instructor, with start and end times.
Proctored lab exams
Timed exams in full-screen mode with violation logging and draft saving.
Safe execution
Student queries are parsed and validated before they run: SELECT only, allowed tables only.
Leaderboards & history
Track submissions and scores, with global and exam-specific rankings.
How it works
Register & verify
Sign up with your registration number, section and session, then confirm with an emailed OTP.
Practice
Solve problems at your own pace and learn from each result.
Complete lab manuals
Work through the exercises your instructor assigns.
Take lab exams
Sit timed exams, then check the leaderboard.
Built for both sides of the classroom
Students
- Dashboard with progress and upcoming exams
- Practice problems, lab manuals and lab exams
- Submission history and leaderboard
Instructors
- Problem bank, lab manuals and lab exams
- Student management by session and section
- Submission reports and leaderboards
