Real questions from top companies in SQL · medium
What are Slowly Changing Dimensions (SCD), and how would you implement them for tracking customer data changes?
What are partitioning strategies in Redshift?
What are some best practices for writing efficient SQL queries?
What are the differences between normalization and denormalization? When would you use a denormalized structure?
What are the types of views?
What challenges arise with duplicate records, and how do you address them?
What factors determine the optimal number of partitions for a large file?
What inspires you to join Walmart?
What is Left Anti Join and its use case?
What is Redshift Spectrum, and how does it differ from standard Redshift queries?
What is UNNEST and provide a query example?
What is a Kafka topic, and how do you choose the number of partitions for it?
What is a cross-join?
What is a semi-join?
What is dynamic partition pruning, and how does it optimize query execution?
What is the difference between UNION and UNION ALL? Which one is faster and why?
What is the difference between static and dynamic partitioning in Hive?
What is the role of a partition in Kafka, and how does it impact scalability?
What is your motivation to join Google?
What is your preferred location, and how soon can you join?
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