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Interview questions · medium
Discuss differences between ROW_NUMBER(), RANK(), and DENSE_RANK(), and provide examples from your projects.
Describe a time when you had to optimize a slow SQL query. What steps did you take?
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.
How would you handle duplicate records in an SQL table?
Describe the use of side inputs in Dataflow.
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