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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
Seniority
L4

Interview Prompt

We run an online store with a customers table and a transactions table, linked by customer id, which the transactions table stores as user_id. Find how many customers have never placed a transaction.

Summary

Customers who have never ordered.

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

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