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Interview questions · medium
Can you explain the difference between OLTP and OLAP?
Explain the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
How do you handle NULL values in SQL? Mention functions like COALESCE and NULLIF.
What is the difference between WHERE and HAVING clauses in SQL?
Why do you want to join EPAM?
Explain how AWS Glue interacts with on-premises SQL databases to extract data efficiently.
Explain how you would implement partitioning and bucketing for data stored in S3 to improve query performance.
What challenges arise with duplicate records, and how do you address them?
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