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SQL prep course

A pattern-by-pattern SQL interview course: 36 problems across 6 patterns, from query basics to window functions and advanced analytics. Follow the arrows — each pattern builds on the ones before it — and tick problems as you solve them so the map fills in and turns green when you finish a pattern.

Shuffle an unsolved problem → Concept notes

✓ Track complete — every pattern solved. Nicely done.

Follow the arrows: finish a topic to unlock what builds on it. Progress is saved on this device.

All patterns