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| Question | Topic | Difficulty | Ask Chance |
|---|---|---|---|
| Modifying a Billion Rows | Performance Tuning & Query Optimization | Medium | Very Low |
Let’s say you have a table with a billion rows. How would you add a column inserting data from the original source without affecting the user experience? | |||
| Payment Data Pipeline | Batch & Stream Processing | Medium | Very Low |
| Closest SAT Scores | SQL | Medium | Very Low |
800+ more questions with detailed answer frameworks inside the guide.
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Real data engineer questions from top companies with guided solution paths.
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*Based on member’s cancellation dates due to finding a job. Typically, members cancel a bit later after their offer.