What is database normalization and why is it important?
Explores the process of organizing data to reduce redundancy and improve integrity.
Why Interviewers Ask This
Normalization is key to efficient database design. Interviewers check if you understand how to structure tables to minimize anomalies and maintain data consistency.
How to Answer This Question
Define normalization as organizing columns and tables to reduce redundancy. Explain normal forms (1NF, 2NF, 3NF). Discuss benefits like data integrity and easier maintenance. Mention trade-offs with query performance in read-heavy systems.
Key Points to Cover
- Reduction of redundancy
- Normal forms
- Data integrity
- Anomaly prevention
Sample Answer
Database normalization organizes data to minimize redundancy and dependency by dividing large tables into smaller, related ones. It follows rules like First Normal Form to eliminate repeating groups. This ensures data integrity, prevents update anomalies, and makes the database easier to maintain and scale over time.
Common Mistakes to Avoid
- Confusing normalization with denormalization
- Ignoring performance trade-offs
- Failing to list specific normal forms
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