Visit to Purchase Conversion Rate

Problem

Return conversion_rate as distinct purchasers divided by distinct visitors.

Why This Matters

SQL interviews usually test whether you can turn a business question into the right rows, grouping level, join type, and edge-case behavior.

Schema

events(user_id INTEGER, event_name TEXT)

Examples

Constraints

• Return only the requested columns.
• Use deterministic ORDER BY when multiple rows are returned.
• Assume SQLite-compatible SQL unless the prompt states otherwise.