Practice with the full bank, then narrow into a path.
Your active path is foundations track, but the catalog stays broad by default so you can spot harder reps, switch contexts quickly, and still return to the path that best matches your current goal. Starter includes 160 free problems and marks 94 Pro-only problems before you open a gate.
Start broad, then focus when you want structure.
Company labels help frame practice in a familiar business context. They are directional study aids, not official interview guidance from the companies listed. We keep all paths visible first so hard questions do not disappear.
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Target
Foundations Track
Top Purchase per Customer
Return each user_id with the purchase_id and amount of that user’s most expensive purchase. If two purchases tie on amount, keep the earlier purchased_at row...
Target
Foundations Track
9904 Highest Target
WITH ranked_targets as ( SELECT first_name, target, bonus, DENSE_RANK() OVER(ORDER BY target desc) as rn FROM employee ) SELECT first_name, target, bonus FRO...
Target
Interview Core Track
Source Target ID Reconciliation
Given two tables source and target, identify the following: IDs present in the source table but not in the target table. IDs present in the target table but ...