Data Analyst interview question
What is the difference between LEFT JOIN and INNER JOIN?
Show practical understanding of join cardinality, missing records, and metric correctness.
A useful answer structure
Answer from your own work.
- 01Start with a precise definition and the constraint it solves.
- 02Explain how join cardinality, missing records, and metric correctness changes your implementation or decision.
- 03Finish with a production example, risk, or verification signal.
Do not memorise a script: use only examples you can explain honestly in follow-up questions.
Practise this answer with MiraHelp
Download MiraHelpOpen the desktop workspace and rehearse a clear answer in your own words.