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Data engineering interview questions
Write an SQL query to find the second-highest salary from an employee table.
Demonstrate the difference between DENSE_RANK() and RANK()
Discuss differences between ROW_NUMBER(), RANK(), and DENSE_RANK(), and provide examples from your projects.
Explain the differences between Data Warehouse, Data Lake, and Delta Lake
Explain the differences between Repartition and Coalesce. When would you use each?
Explain the differences between a Data Lake and a Data Warehouse.
What is the difference between partitioning and bucketing in Spark, and when would you use bucketing?
Can you explain the difference between OLTP and OLAP?
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