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Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependencies
F= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?
AC → H
F= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?
AC → H
- a)AC → H
- b)C → H
- c)G → H
- d)A → H
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Given a relation schema R(ABCDEFGH) in first normal form. For the set ...
Explanation:
Given Dependencies:
- A → B
- A → C
- CG → H
- B → H
- G → F
Using Armstrong's Axioms:
- Given dependencies can be used to derive new dependencies using Armstrong's axioms.
- We can use transitivity rule and decompositions to find logically implied dependencies.
Deriving Dependency:
- We need to find if A → H can be logically implied from the given set of dependencies.
Using Transitivity Rule:
- From A → B and B → H, we can derive A → H using transitivity rule.
Therefore, the logically implied dependency is:
- A → H
Correct Answer:
- Option D: A → H
By using the given set of dependencies and applying Armstrong's axioms, we can logically imply the dependency A → H.
Given Dependencies:
- A → B
- A → C
- CG → H
- B → H
- G → F
Using Armstrong's Axioms:
- Given dependencies can be used to derive new dependencies using Armstrong's axioms.
- We can use transitivity rule and decompositions to find logically implied dependencies.
Deriving Dependency:
- We need to find if A → H can be logically implied from the given set of dependencies.
Using Transitivity Rule:
- From A → B and B → H, we can derive A → H using transitivity rule.
Therefore, the logically implied dependency is:
- A → H
Correct Answer:
- Option D: A → H
By using the given set of dependencies and applying Armstrong's axioms, we can logically imply the dependency A → H.
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Community Answer
Given a relation schema R(ABCDEFGH) in first normal form. For the set ...
Concept:
If A → B and B → C then A → C is logically implied to A → B and B → C FDs this is nothing but transitivity rule.
If A → B and B → C then A → C is logically implied to A → B and B → C FDs this is nothing but transitivity rule.
Explanation:
A → B
B → H
Then we can say that A->H which is logically implied by above both FDs
So option 4 is the correct answer.
A → B
B → H
Then we can say that A->H which is logically implied by above both FDs
So option 4 is the correct answer.
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Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer?
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Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer?.
Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Given a relation schema R(ABCDEFGH) in first normal form. For the set of dependenciesF= { A → B, A → C, CG → H, B → H, G → F}, which dependency is logically implied?AC → Ha)AC → Hb)C → Hc)G → Hd)A → HCorrect answer is option 'D'. Can you explain this answer?.
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