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For a violation of 2NF to occur in a table in 1NF, the following condition(s) must exist:
- a)There must be some specific non trivial multivalued dependencies
- b)There must be transitive dependencies
- c)Part of a key determines a nonkey attribute
- d)All of the above
Correct answer is option 'C'. Can you explain this answer?
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For a violation of 2NF to occur in a table in 1NF, the following cond...
A relation is in 2NF, if it is in 1NF and no non prime attribute is dependent on any proper subset of any candidate key of the relation. A non prime attribute of a relation is an attribute that is not a part of any candidate key of the relation.
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For a violation of 2NF to occur in a table in 1NF, the following cond...
Understanding 2NF Violations
To comprehend why option 'C' is the correct answer, it's essential to grasp the concept of Second Normal Form (2NF) in database normalization.
What is 2NF?
- A table is in 2NF if it is in First Normal Form (1NF) and all non-key attributes are fully functionally dependent on the primary key.
- This means that there should be no partial dependency of any column on the primary key.
Conditions Leading to 2NF Violation
- For a table in 1NF to violate 2NF, the following must hold true:
Conclusion
- The essence of the 2NF violation lies in the existence of partial dependencies, specifically where a portion of a composite key determines a non-key attribute.
- Therefore, option 'C' accurately encapsulates the primary condition for a 2NF violation, making it the correct answer.
Understanding these principles helps in designing efficient and normalized databases, ensuring data integrity and reducing redundancy.
To comprehend why option 'C' is the correct answer, it's essential to grasp the concept of Second Normal Form (2NF) in database normalization.
What is 2NF?
- A table is in 2NF if it is in First Normal Form (1NF) and all non-key attributes are fully functionally dependent on the primary key.
- This means that there should be no partial dependency of any column on the primary key.
Conditions Leading to 2NF Violation
- For a table in 1NF to violate 2NF, the following must hold true:
- Part of a key determines a non-key attribute: This is the primary condition for 2NF violation. If a non-key attribute is dependent on only a part of a composite primary key, this constitutes a partial dependency.
- Transitive dependencies: While transitive dependencies can lead to Third Normal Form (3NF) violations, they do not directly cause 2NF violations. Thus, this condition is not a requirement for 2NF violations.
- Multivalued dependencies: These are not directly related to 2NF violations. They are more relevant to Fourth Normal Form (4NF) issues.
Conclusion
- The essence of the 2NF violation lies in the existence of partial dependencies, specifically where a portion of a composite key determines a non-key attribute.
- Therefore, option 'C' accurately encapsulates the primary condition for a 2NF violation, making it the correct answer.
Understanding these principles helps in designing efficient and normalized databases, ensuring data integrity and reducing redundancy.
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For a violation of 2NF to occur in a table in 1NF, the following condition(s) must exist:a)There must be some specific non trivial multivalued dependenciesb)There must be transitive dependenciesc)Part of a key determines a nonkey attributed)All of the aboveCorrect answer is option 'C'. Can you explain this answer?
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