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Questions and Answers
What is the main goal of database normalization?
What is the main goal of database normalization?
What is a characteristic of a table in First Normal Form (1NF)?
What is a characteristic of a table in First Normal Form (1NF)?
What is eliminated in a table that is in Second Normal Form (2NF)?
What is eliminated in a table that is in Second Normal Form (2NF)?
What is a characteristic of a table in Third Normal Form (3NF)?
What is a characteristic of a table in Third Normal Form (3NF)?
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What is a benefit of denormalization?
What is a benefit of denormalization?
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What is a key point to remember about normalization?
What is a key point to remember about normalization?
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Why is eliminating data redundancy important?
Why is eliminating data redundancy important?
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Study Notes
Database Normalization
Database normalization is the process of organizing the fields and tables of a database to minimize data redundancy and dependency.
First Normal Form (1NF)
- Each table cell must contain a single value.
- Each column must have a unique name.
- No repeating groups or arrays are allowed.
- Each row must have a unique combination of values.
Second Normal Form (2NF)
- A table is in 2NF if it is in 1NF and all non-prime attributes are fully functional dependent on the primary key.
- A non-prime attribute is fully functional dependent on the primary key if its value depends on the primary key.
- 2NF eliminates partial dependencies.
Third Normal Form (3NF)
- A table is in 3NF if it is in 2NF and there are no transitive dependencies.
- A transitive dependency occurs when a non-prime attribute depends on another non-prime attribute.
- 3NF eliminates transitive dependencies.
Key points to remember:
- Normalization helps to:
- Eliminate data redundancy
- Reduce data anomalies
- Improve data integrity
- Denormalization can be used to improve performance in certain situations.
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Description
Learn about the process of organizing database fields and tables to minimize data redundancy and dependency. Understand the rules and benefits of First, Second, and Third Normal Forms.
