Real questions from top companies in SQL
What is UNNEST and provide a query example?
What is a Data Warehouse, and can you explain its Tier-1 and Tier-2 architecture?
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 Data Lakehouse, Delta Lake, and a Data Warehouse?
What is the difference between SELECT, COUNT(*), and COUNT(1)?
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 purpose of Delta format, and how does it differ from Parquet in terms of storage and querying?
What is the role of a partition in Kafka, and how does it impact scalability?
What is the stored procedure syntax and execution?
What is your motivation to join Google?
What is your notice period, and are you interviewing elsewhere?
What is your preferred location, and how soon can you join?
What metrics would trigger an auto-scaling event?
What metrics would you analyze to determine if your partitioning strategy is effective?
What motivates you to join Morgan Stanley?
What optimizations would you apply for partitioning strategies?
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