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Interview questions
Explain the differences between Repartition and Coalesce. When would you use each?
How do you optimize Spark jobs for better performance? Mention at least 5 techniques.
Retrieve the most recent sale_timestamp for each product (Latest Transaction).
Difference between ROW_NUMBER(), RANK(), and DENSE_RANK() with examples.
Difference between where and having clause with examples.
Explain the difference between UNION and UNION ALL.
What are primary keys and foreign keys? Why are they important?
What is a self-join, and when would you use it?
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