Customers Without Orders
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
- Seniority
- L4
Interview Prompt
The customers table and the transactions table are linked by customer id: the customer_id column in customers corresponds to the user_id column in transactions. Count how many customers have never placed a transaction. Return a single integer.
Summary
Customers who have never ordered.
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