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Questions tagged sql · hard
What is the difference between SparkSession and SparkContext in Spark?
What is a Common Table Expression (CTE), and when would you use it?
What is the difference between a primary key and a unique key?
How does Spark's Catalyst Optimizer work? Explain its stages.
How do you optimize Spark jobs for better performance? Mention at least 5 techniques.
What is Snowflake's architecture, and why is it unique?
Retrieve the most recent sale_timestamp for each product (Latest Transaction).
What is the difference between OLTP and OLAP?
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