Both Ways
A hard SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L4
Interview Prompt
We're reconciling daily net revenue for an online marketplace over a window earlier in the year. Give each day's net revenue, where purchases add to the total and refunds pull it back down.
Summary
Money flows in and money flows back. Reconcile the day.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision