Double Vision
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
- L3
Interview Prompt
Ahead of a CRM migration, the data quality team is hunting for email addresses that were entered against more than one account. For each email tied to multiple accounts, return the address, how many accounts carry it, and the earliest and most recent signup dates, with the most-repeated addresses first.
Summary
Before the records move, the ones wearing the same name twice have to surface.
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