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Mutual Channel Connections

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

Interview Prompt

Our messaging platform tracks which senders post in which channels. Find all sender IDs that appear in at least one channel where user 197 posted and also in at least one channel where user 585 posted, excluding those two users themselves.

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