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Questions tagged partition · medium
What is the difference between repartition and coalesce in Apache Spark?
Write an SQL query to find the second-highest salary from an employee table.
What is the difference between cache() and persist() in Spark? When would you use each?
What is the difference between groupByKey and reduceByKey in Spark?
What is the difference between narrow and wide transformations in Apache Spark? Explain with examples.
Demonstrate the difference between DENSE_RANK() and RANK()
Explain the differences between Data Warehouse, Data Lake, and Delta Lake
Explain the differences between Repartition and Coalesce. When would you use each?
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