Use a RIGHT JOIN to show all transactions alongside the username of the buyer
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
Use a RIGHT JOIN to show all transactions alongside the username of the buyer. Include transactions whose user_id does not match any user (orphaned records). Return username and transaction_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