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Transaction Timeline

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
L3

Interview Prompt

Finance wants a one-row-per-customer purchase snapshot for the lifetime-value model. For each user with at least one transaction, find their earliest and latest transaction_date and their total spending. Return the username and those three aggregates.

Summary

First purchase to last. The full spending arc.

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

Related

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