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Count ad impressions per day, with dates formatted as compact YYYYMMDD strings

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

Count ad impressions per day, with dates formatted as compact YYYYMMDD strings. Return the compact date and impression count, ordered by date.

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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