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Given a relation is in 3NF, Which of the following can be inferred from this?
- a)Each non key attribute is determined by the super key
- b)Every determinant is a candidate key
- c)All attribute included in the primary key
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Given a relation is in 3NF, Which of the following can be inferred fr...
Each non key attribute is determined by the super key,
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A relation C-> D is in 3NF if,
1) C is a super key
or
2) D is a prime attribute
If D is a non prime attribute then C must be a super key.
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Given a relation is in 3NF, Which of the following can be inferred fr...
Understanding 3NF (Third Normal Form)
Third Normal Form (3NF) is a crucial step in database normalization aimed at reducing redundancy and ensuring that non-key attributes are only dependent on primary keys.
Key Characteristics of 3NF
- Eliminates Transitive Dependencies: In 3NF, a non-key attribute should not depend on another non-key attribute. This ensures that all non-key attributes are directly related to the primary key.
- Non-key Attributes: Each non-key attribute must be fully functionally dependent on the primary key, which means it should be determined by the primary key or any super key.
Correct Answer Explanation: Option A
- Each Non-key Attribute is Determined by the Super Key: This is true in 3NF. A super key is any combination of attributes that can uniquely identify rows in a table. Thus, non-key attributes are entirely dependent on super keys, ensuring no transitive dependencies exist.
Other Options Analysis
- Option B: Every Determinant is a Candidate Key: This statement is not accurate in 3NF. While it is true that determinants should ideally be candidate keys, it is not a strict requirement for 3NF.
- Option C: All Attributes Included in the Primary Key: This statement is incorrect because 3NF allows other non-key attributes. Not all attributes in a table need to be part of the primary key.
- Option D: None of the Above: This is also incorrect since Option A is a valid inference.
In conclusion, when a relation is in 3NF, it is accurate to state that each non-key attribute is determined by the super key, confirming the integrity and efficiency of the database structure.
Third Normal Form (3NF) is a crucial step in database normalization aimed at reducing redundancy and ensuring that non-key attributes are only dependent on primary keys.
Key Characteristics of 3NF
- Eliminates Transitive Dependencies: In 3NF, a non-key attribute should not depend on another non-key attribute. This ensures that all non-key attributes are directly related to the primary key.
- Non-key Attributes: Each non-key attribute must be fully functionally dependent on the primary key, which means it should be determined by the primary key or any super key.
Correct Answer Explanation: Option A
- Each Non-key Attribute is Determined by the Super Key: This is true in 3NF. A super key is any combination of attributes that can uniquely identify rows in a table. Thus, non-key attributes are entirely dependent on super keys, ensuring no transitive dependencies exist.
Other Options Analysis
- Option B: Every Determinant is a Candidate Key: This statement is not accurate in 3NF. While it is true that determinants should ideally be candidate keys, it is not a strict requirement for 3NF.
- Option C: All Attributes Included in the Primary Key: This statement is incorrect because 3NF allows other non-key attributes. Not all attributes in a table need to be part of the primary key.
- Option D: None of the Above: This is also incorrect since Option A is a valid inference.
In conclusion, when a relation is in 3NF, it is accurate to state that each non-key attribute is determined by the super key, confirming the integrity and efficiency of the database structure.
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Given a relation is in 3NF, Which of the following can be inferred from this?a)Each non key attribute is determined by the super keyb)Every determinant is a candidate keyc)All attribute included in the primary keyd)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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