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Left Join

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

Domain
Python
Difficulty
medium

Interview Prompt

Our pipeline needs a left join between two in-memory datasets keyed on a shared field. Keep all records from the left list, attaching matching fields from the right list. If no right-side match exists, omit those fields rather than adding None keys.

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 python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision