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Notifications Pivot by Weekday

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
mid, senior

Interview Prompt

Build a notification volume breakdown pivoted by platform and day of week, scoped to users enrolled in at least one experiment. Rows should be days of the week (0=Sunday through 6=Saturday), with separate count columns for ios, android, and web. Return the day of week and each platform's count.

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