Real questions from top companies in SQL
What are the trade-offs between relational databases and NoSQL for financial data?
What challenges arise with duplicate records, and how do you address them?
What considerations are important when designing a dimensional model for a ridesharing app?
What factors determine the optimal number of partitions for a large file?
What is BigQuery Cache?
What is CTE in SQL?
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 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 UNION and UNION ALL? Which one is faster and why?
What is the difference between static and dynamic partitioning in Hive?
What optimizations would you apply for partitioning strategies?
What strategies and technologies would you consider when designing a data warehouse architecture for efficient data storage and retrieval?
What strategies would you use to manage dynamic partitions efficiently?
When would you choose partitioning over bucketing, or vice versa?
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