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What is the purpose of Normalization in SQL?
What is the purpose of Normalization in SQL?
- To increase data redundancy and improve data retrieval
- To complicate database design for better performance
- To create undesirable characteristics like Insertion, Update and Deletion Anomalies
- To eliminate redundant data and ensure logical data storage (correct)
What is the purpose of a composite key in a database?
What is the purpose of a composite key in a database?
- To store data illogically
- To increase redundancy in the database
- To uniquely identify a database record using multiple columns (correct)
- To complicate data retrieval from the database
In which normal form does normalization achieve its best in most practical applications?
In which normal form does normalization achieve its best in most practical applications?
- 1st Normal Form
- 4th Normal Form
- 3rd Normal Form (correct)
- 2nd Normal Form
Who proposed the theory of normalization of data with the introduction of First Normal Form?
Who proposed the theory of normalization of data with the introduction of First Normal Form?
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Study Notes
Normalization in SQL
- Normalization in SQL is used to minimize data redundancy and dependency by organizing fields and tables to minimize data redundancy and dependency.
Composite Key in a Database
- A composite key in a database is a primary key composed of more than one attribute (column) that uniquely identifies a record in a table.
Best Normalization in Practical Applications
- Normalization achieves its best in 3NF (Third Normal Form) in most practical applications.
Theory of Normalization
- Edgar F. Codd proposed the theory of normalization of data with the introduction of First Normal Form (1NF).
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