SQL Quiz

About the SQLMentor quiz

The SQL Quiz is a fast, free way to check what you know — and what you don't. Questions are drawn from real SQL learning scenarios across Oracle, PostgreSQL, MySQL, and SQL Server. There are no accounts, nothing to install, and your score is saved locally in your browser so you can come back and pick up where you left off.

How the quiz works

Each question is a multiple-choice problem with one correct answer. Click any option to lock in your choice — you'll get instant feedback plus a written explanation, even if you get it right. The progress bar at the top of the page tracks how far you've gotten through the current pool.

Difficulty levels

• Easy — fundamentals: SELECT, WHERE, basic joins, common functions.
• Medium — subqueries, multi-table joins, GROUP BY + HAVING, aggregates.
• Hard — window functions, CTEs (including recursive), set operators, advanced analytics.

Where to go next

If a question stumps you, the Oracle SQL tutorial and PostgreSQL tutorial cover every topic in depth with worked examples. Working towards a certification? The Cert Practice pages offer timed full-length mock exams for 1Z0-071, 1Z0-082, and 1Z0-149.