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Questions tagged join · medium
What is the difference between narrow and wide transformations in Apache Spark? Explain with examples.
Explain the differences between Repartition and Coalesce. When would you use each?
What is the difference between partitioning and bucketing in Spark, and when would you use bucketing?
What strategies can you use to handle skewed data in Spark?
Describe a time when you had to optimize a slow SQL query. What steps did you take?
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.
Write a Python function to check if a string is a palindrome.
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