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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

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.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision