Real questions from top companies
What are the types of views?
What are your expectations for the role beyond the salary?
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 if another company offers a better salary—would you stay or leave?
What inspires you to join Walmart?
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 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?
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