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The Duplicate Detection Sprint

A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
easy
Seniority
junior, mid

Interview Prompt

Given a customers table with email addresses and signup dates, write a query to find all email addresses that appear more than once. For each duplicate email, return the email, the count of occurrences, and the earliest and most recent signup dates.

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