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Programming Quiz

SQL Quiz

Joins, aggregates, indexes, and query design — this SQL quiz checks whether you can actually query data well. Great for data and backend interview prep.

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What you'll be tested on

How it works

1. Pick your mode. Play solo to learn at your own pace, or host a room and battle friends live.

2. Answer timed questions. Fresh AI-generated questions every round — no two games are the same.

3. Climb the leaderboard. Track streaks, XP and accuracy as you master SQL.

Frequently asked questions

Does the SQL quiz include joins?

Yes — inner, outer, and self joins are core to the question set.

Is it database-specific?

It focuses on standard SQL concepts that apply across MySQL, Postgres, and others.

Is JBattle free?

Yes. Playing quizzes, hosting rooms, and challenging friends on JBattle is completely free and runs in your browser — no download needed.

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