Not every payload has a currency field (only some purchases do)
A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- medium
Interview Prompt
Not every payload has a currency field (only some purchases do). Return event_id and currency for events whose payload actually contains a currency value (skip the NULLs), ordered by event_id.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision