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Flatten Org Chart Hierarchy

A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
hard
Seniority
senior

Interview Prompt

Given a table where each row has an ID and a parent_id (NULL for root nodes), write a recursive query that returns every node with its depth level and the full path from root to node as a concatenated string.

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