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Real questions from top companies in SQL · medium
Explain row_number, rank, and dense_rank with examples.
Explain the difference between a clustered and non-clustered index.
Explain the difference between a fact table and a dimension table.
Explain the difference between a primary key and a unique key.
Explain the concept of window functions in SQL and provide an example
Explain the difference between Star and Snowflake schemas. When would you choose one over the other?
Explain the difference between partition count and query performance in Spark.
Explain the differences between table re-creation and ALTER TABLE operations.
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