GATE Exam > GATE Questions > Consider a relational table R that is in 3NF,...
Start Learning for Free
Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?
- a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.
- b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.
- c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.
- d)A cell in R holds a set instead of an atomic value.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Consider a relational table R that is in 3NF, but not in BCNF. Which o...
R(A, B, C, D, E)
FD:
‘x’ is not super key and ‘A’ is prime attribute.
FD:
‘x’ is not super key and ‘A’ is prime attribute.Most Upvoted Answer
Consider a relational table R that is in 3NF, but not in BCNF. Which o...
Implies Y, where X is not a superkey and Y is a prime attribute.
b)R has a non-trivial functional dependency X implies Y, where X is a superkey and Y is a prime attribute.
c)R has a non-trivial multivalued dependency X implies Y, where X and Y are sets of attributes.
d)R has a non-trivial transitive dependency X implies Y, where X and Y are sets of attributes.
The correct answer is a) R has a non-trivial functional dependency X implies Y, where X is not a superkey and Y is a prime attribute.
Explanation: 3NF ensures that there are no transitive dependencies in the table, but it does not guarantee that there are no functional dependencies where X is not a superkey. BCNF, on the other hand, eliminates all non-trivial functional dependencies. Therefore, a table in 3NF, but not in BCNF, can have a non-trivial functional dependency where X is not a superkey and Y is a prime attribute.
b)R has a non-trivial functional dependency X implies Y, where X is a superkey and Y is a prime attribute.
c)R has a non-trivial multivalued dependency X implies Y, where X and Y are sets of attributes.
d)R has a non-trivial transitive dependency X implies Y, where X and Y are sets of attributes.
The correct answer is a) R has a non-trivial functional dependency X implies Y, where X is not a superkey and Y is a prime attribute.
Explanation: 3NF ensures that there are no transitive dependencies in the table, but it does not guarantee that there are no functional dependencies where X is not a superkey. BCNF, on the other hand, eliminates all non-trivial functional dependencies. Therefore, a table in 3NF, but not in BCNF, can have a non-trivial functional dependency where X is not a superkey and Y is a prime attribute.
|
Explore Courses for GATE exam
|
|
Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer?
Question Description
Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct 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 Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct 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 Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer?.
Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct 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 Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct 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 Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE.
Download more important topics, notes, lectures and mock test series for GATE Exam by signing up for free.
Here you can find the meaning of Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?a)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a prime attribute.b)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is not a proper subset of any key.c)R has a non-trivial functional dependency X → A, where X is not a superkey and A is a non-prime attribute and X is a proper subset of some key.d)A cell in R holds a set instead of an atomic value.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice GATE tests.
|
|
Explore Courses for GATE exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup