First Arrivals
A medium 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
- medium
- Seniority
- L5
Interview Prompt
We're tracking customer acquisition. For each calendar date, how many customers placed their very first order that day, where a customer's first-order date is the earliest order they have in the table?
Summary
Every customer has a first day. Find when the crowds showed up.
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