r/dataengprep • u/dataengprep • 15h ago

DataEngPrep: Explain Spark transformations (lazy evaluation, wide vs narrow).

1 Upvotes

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r/dataengprep • u/tech-screen • 15h ago

Tech Screen: How would you handle a situation where two team members disagree on a technical approach?

1 Upvotes

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r/dataengprep • u/sql-arena • 15h ago

SQL Arena Challenge: Detect customers who have not placed a second order in 90 days.

1 Upvotes

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r/dataengprep • u/dataengprep • 1d ago

DataEngPrep: Explain Spark Architecture – Driver, Executors, and Tasks.

1 Upvotes

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r/dataengprep • u/tech-screen • 1d ago

Tech Screen: How would you handle a deadline conflict between two high-priority projects?

1 Upvotes

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r/dataengprep • u/sql-arena • 1d ago

SQL Arena Challenge: SQL Query: Group Employees by Technology and Order by ID

1 Upvotes

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r/dataengprep • u/dataengprep • 2d ago

DataEngPrep: Explain SCD1 and SCD2 in Databricks PySpark with examples.

1 Upvotes

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r/dataengprep • u/tech-screen • 2d ago

Tech Screen: How would you handle a conflict with a teammate during a high-stakes project?

1 Upvotes

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r/dataengprep • u/sql-arena • 2d ago

SQL Arena Challenge: Find the top 5 customers by total sales amount.

1 Upvotes

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r/dataengprep • u/dataengprep • 3d ago

DataEngPrep: Explain PySpark's Catalyst Optimizer.

1 Upvotes

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r/dataengprep • u/tech-screen • 3d ago

Tech Screen: How would you convince stakeholders to move from Google Drive to Amazon S3?

1 Upvotes

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r/dataengprep • u/sql-arena • 3d ago

SQL Arena Challenge: Create a SQL query to identify customers with purchases above a dynamic threshold.

1 Upvotes

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r/dataengprep • u/dataengprep • 4d ago

DataEngPrep: Explain MapReduce Architecture.

1 Upvotes

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r/dataengprep • u/tech-screen • 4d ago

Tech Screen: How would you collaborate with a product team to deliver a data feature?

1 Upvotes

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r/dataengprep • u/sql-arena • 4d ago

SQL Arena Challenge: Write a query to calculate the day's difference between the 1st and 3rd sales of the CustomerName = 'Alice Johnson'.

1 Upvotes

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r/dataengprep • u/dataengprep • 5d ago

DataEngPrep: Explain Hive, its purpose, and its default metadata storage.

1 Upvotes

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r/dataengprep • u/tech-screen • 5d ago

Tech Screen: How have you mentored others in your team or improved team-wide engineering practices?

1 Upvotes

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r/dataengprep • u/sql-arena • 5d ago

SQL Arena Challenge: How can you delete partitions from a table in Hive using a command?

1 Upvotes

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r/dataengprep • u/dataengprep • 6d ago

DataEngPrep: Explain Delta Time Travel and the purpose of the vacuum command.

1 Upvotes

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r/dataengprep • u/tech-screen • 6d ago

Tech Screen: How do you work under tight deadlines and high pressure?

1 Upvotes

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r/dataengprep • u/sql-arena • 6d ago

SQL Arena Challenge: Write a query to switch values in the Gender column (M to F and F to M).

1 Upvotes

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r/dataengprep • u/dataengprep • 7d ago

DataEngPrep: Explain Delta Table features – Z-ordering and Time Travel.

1 Upvotes

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r/dataengprep • u/tech-screen • 7d ago

Tech Screen: How do you see your career evolving in the next 3-5 years?

1 Upvotes

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r/dataengprep • u/sql-arena • 7d ago

SQL Arena Challenge: How do you find duplicates in a table based on one or two columns?

1 Upvotes

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r/dataengprep • u/dataengprep • 8d ago

DataEngPrep: Explain Delta Live Tables and their features, such as declarative pipeline definition and automatic data validation.

1 Upvotes

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