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Database Interview Questions & Answers

Database Technical Interview Questions

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What is normalization, and when might denormalization be justified?

Normalization organizes relational data to reduce unnecessary duplication and update anomalies. For example, storing a customer’s address once avoids inconsistent edits across many order rows when the...

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How do a primary key, foreign key, and unique constraint serve different purposes?

A primary key identifies each row and is non-NULL. A foreign key enforces an allowed relationship to a referenced key, helping prevent orphaned data. A unique constraint prevents duplicate combination...

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