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Interview questions
Describe a scenario where partitioning and bucketing would improve query performance.
When would you choose a Snowflake schema over a Star schema?
Implement a query to find the top 5 customers by total sales amount.
Write an SQL query to find duplicate emails in a users table.
Given a streaming dataset from Kafka, how would you ingest the data in real-time using Spark?
Tell me about a time you handled a data pipeline failure during a critical operation.
Compare batch processing and stream processing for financial data.
Compute the moving average of daily transactions over a 7-day window.
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