SQL Case

Mobile engagement: first success

Mobile engagement: Return the first goal_completed timestamp for each device_user that succeeded.

What this task practices

Mobile engagement: first success is a sql case interview exercise that trains prompt interpretation, explicit assumptions, a concrete response, and a clear explanation of tradeoffs. The catalog marks it as easy difficulty. It focuses on Data Reasoning, Performance Analysis, Technical Reasoning. The signed-in workspace provides the tools for the round and evaluates the attempt against task-specific criteria. Reference solutions, hidden checks, evaluator instructions, and candidate work remain private.