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Interview questions · medium
What is the difference between repartition and coalesce in Apache Spark?
What is the difference between narrow and wide transformations in Apache Spark? Explain with examples.
Explain the difference between Spark's map() and flatMap() transformations.
Explain the concept of Broadcast Join in Spark. When should it be used?
What is the difference between SQL and NoSQL databases?
Explain SQL Window Functions with examples.
Explain the use of the MERGE statement in SQL.
How do you handle NULL values in SQL? Mention functions like COALESCE and ISNULL.
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