How would you build a SQL query for a conversion funnel?
Tests your ability to translate a business need into a technical SQL solution. A good answer uses CTEs or LEFT JOINs to model sequential steps, counts users at each stage, and discusses attribution.
This tests your ability to translate a business need (funnel analysis) into a technical SQL solution, considering key product analytics concepts like event ordering and time windows. A great answer first clarifies the funnel definition (steps, sequence, time), then outlines a query using CTEs or LEFT JOINs for each step, counts distinct users, and calculates drop-off. A common red flag is jumping straight to a complex query without defining the business logic, which leads to incorrect analysis.
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