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Real questions from top companies in SQL · medium

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1

What are Slowly Changing Dimensions (SCD), and how would you implement them for tracking customer data changes?

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2

What are partitioning strategies in Redshift?

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3

What are some best practices for writing efficient SQL queries?

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4

What are the differences between normalization and denormalization? When would you use a denormalized structure?

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5

What are the types of views?

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6

What challenges arise with duplicate records, and how do you address them?

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7

What factors determine the optimal number of partitions for a large file?

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8

What inspires you to join Walmart?

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