Which of the following is a common data transformation method used to aggregate data?

Filtering
Grouping
Joining
Sorting

Grouping is a common data transformation method used to aggregate data in ETL processes. It involves combining rows with similar characteristics and summarizing their values to create consolidated insights or reports.

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Data Engineer Quiz

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A ________ is a unique identifier for each row in a table and is often used to establish relationships between tables in a relational database.

Scenario: You are tasked with assessing the quality of a large dataset containing customer information. Which data quality assessment technique would you prioritize to ensure that the data is accurate and reliable?

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Which of the following is a common data transformation method used to aggregate data?

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