Adaptive skill practice — find your level, get sharper.
SQL practice
Predict query results — and learn why
Master SQL by predicting what queries return — SELECT and WHERE filtering, JOINs, GROUP BY with aggregates (COUNT/SUM/AVG/MIN/MAX), HAVING, ORDER BY and LIMIT, DISTINCT, and the NULL semantics that trip people up (= NULL vs IS NULL, COUNT(col) vs COUNT(*)). Every answer is computed by running real SQLite, so the explanations are exact. Output-prediction practice that builds genuine query fluency for interviews. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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