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Second Normal Form (2NF) | Database Normalization | DBMS Video Lecture | Database Management System (DBMS) - Computer Science Engineering (CSE)
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FAQs on Second Normal Form (2NF) - Database Normalization - DBMS Video Lecture - Database Management System (DBMS) - Computer Science Engineering (CSE)
| 1. What is Second Normal Form (2NF) in database normalization? |  |
Ans. Second Normal Form (2NF) is a database normalization technique that ensures that all non-key attributes are fully functional dependent on the primary key. It eliminates partial dependencies by requiring that every non-prime attribute is dependent on the entire primary key.
| 2. How is Second Normal Form (2NF) different from First Normal Form (1NF)? | |
Ans. In First Normal Form (1NF), the requirements are that the data is in tabular format and each attribute contains atomic values. In Second Normal Form (2NF), the data must first satisfy 1NF and then ensure that all non-key attributes are fully functional dependent on the primary key to eliminate partial dependencies.
| 3. Why is Second Normal Form (2NF) important in database design? | |
Ans. Second Normal Form (2NF) is important in database design because it helps reduce data redundancy and inconsistencies by eliminating partial dependencies. It ensures that the database is structured in such a way that data integrity is maintained and updates, inserts, and deletes do not result in anomalies.
| 4. What are some examples of violating Second Normal Form (2NF) in a database? | |
Ans. An example of violating 2NF would be having a composite key where one of the attributes determines another non-key attribute. This would create partial dependencies and violate the principles of Second Normal Form.
| 5. How can you achieve Second Normal Form (2NF) in a given database schema? | |
Ans. To achieve Second Normal Form (2NF) in a given database schema, you need to first ensure that it is in First Normal Form (1NF). Then, identify and remove any partial dependencies by splitting the table into multiple tables, each with a unique primary key and all non-key attributes fully dependent on the primary key.
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Nov 22, 2024 Last updated |
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