Real questions from top companies
Delete vs. Truncate in Snowflake?
Demonstrate how to use a LEFT JOIN to combine data from two tables and handle null values.
Describe a challenging project where you optimized a complex ETL process.
Describe a recent project where you used AWS services extensively. What was your role, and what challenges did you face?
Describe a scenario where you disagreed with a product or business team. What did you do?
Describe a scenario where you had to collaborate with a cross-functional team to deliver a solution.
Describe a scenario where you had to make trade-offs between data processing speed and accuracy. How did you approach this situation and what was the outcome?
Describe a scenario where you used Databricks for real-time data processing.
Describe a scenario where you would use a CROSS JOIN vs. an INNER JOIN.
Describe a situation where you had to redesign a data model to meet changing business needs
Describe a situation where you made a mistake in a data pipeline. How did you identify and fix it?
Describe a situation where you prioritized business needs over technical elegance. How did you manage trade-offs?
Describe how Dataproc integrates with BigQuery for processing large datasets.
Describe how metadata is stored and accessed for internal tables in a relational database.
Describe how partitioning helps improve query performance in a large dataset.
Describe how you would implement Slowly Changing Dimensions (SCD) in an ETL workflow.
Describe strategies for optimizing a slow-running query on a massive dataset.
Describe the process for migrating data from an on-premises SQL database to AWS. What services and strategies would you use?
Design a Custom API that can query a backend server and return customer data such as the number of orders placed by a user based on their user ID
Design a daily ETL pipeline to ingest API data into BigQuery.
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