SQL · Coinbase · Hard
This exercise set checks your ability to join events back to their sessions, filter on time windows, remove duplicates, read JSON payloads, and turn raw activity into funnel and retention numbers, in both SQL and pandas. All timestamps are UTC, and for every part treat the current date as 2025-09-01. Three tables are available: users(id, country, hire_date, visa_status, is_remote) with one row per person; sessions(session_id, user_id, session_start, session_end, device)…
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