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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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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? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about 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? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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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