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Data Ware Housing MCQ Questions

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Q1 Easy

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What is true of querying normalized data in a relational database for the purposes of business analysis?

All of the Above

Aggregating relevant data requires the creation of new primary keys

Aggregating relevant data requires multiple table joins

The data must first be placed into a data warehouse via the ETL process

Explanation

Aggregating relevant data requires multiple table joins when data is normalized. 3NF splits data across many tables requiring joins to reconstruct complete information. Challenges: complex SQL, slower performance, query complexity. This motivates dimensional modeling for analytics. Data doesn't require ETL to warehouse first (though recommended for performance). New primary keys not needed for aggregation. Multiple joins are inherent to normalized structures. This is why data warehouses use denormalized star schemas - fewer joins, faster queries, better for analysis.

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