SQL · Meta · Hard
You are given five relational tables that record user signups, app-open activity, orders, payments, and refunds. All timestamp columns are stored in UTC. For the calendar month August 2025, use the half-open window [2025-08-01 00:00:00, 2025-09-01 00:00:00). Write a single PostgreSQL query that returns one row for every distinct signup cohort month present in users, where the cohort month is: Return these columns in this exact order, using these exact names: cohort_month —…
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