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A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- senior
Problem
Calculate the conversion rate from free signup to paid subscription, broken down by referral source. The growth team wants to decide where to increase ad spend next quarter. Round to 4 decimal places.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.