Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Which of the following statement is false?a)A...
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Which of the following statement is false?
- a)Any relation can be decomposed into a number of relations that are in third normal form, such decomposition is lossless and preserves the dependencies.
- b)Any relation can be decomposed losslessly into relations in BCNF and decomposition into BCNF always preserve dependency.
- c)The decomposition approach using the BCNF may produce inter-relational join constraints.
- d)A decomposition of relation, into BCNF is not unique.
Correct answer is option 'B'. Can you explain this answer?
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Which of the following statement is false?a)Any relation can be decomp...
BCNF relation may or may not preserve dependency also any relation cannot be necessarily decomposed into BCNF relation,
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Which of the following statement is false?a)Any relation can be decomp...
Understanding Decomposition in Database Normalization
When discussing database normalization, particularly in the context of BCNF (Boyce-Codd Normal Form), each statement regarding decomposition has implications for data integrity and dependency preservation. Let's analyze why option 'B' is considered false.
Statement Breakdown
- a) Decomposition into 3NF:
- Any relation can be decomposed into a set of relations that are in Third Normal Form (3NF). This decomposition is guaranteed to be lossless and preserves dependencies. This statement is true.
- b) Decomposition into BCNF:
- While it is true that any relation can be decomposed into BCNF, the claim that this decomposition always preserves dependencies is false. In some cases, decomposing a relation into BCNF may lead to a loss of certain functional dependencies, thus violating dependency preservation. Therefore, this statement is misleading.
- c) Inter-relational join constraints:
- The decomposition process using BCNF may indeed result in inter-relational join constraints, which are necessary to maintain the relationships between decomposed relations. This statement is true.
- d) Uniqueness of BCNF decomposition:
- A decomposition of a relation into BCNF is not unique. There can be multiple ways to achieve BCNF for the same relation, leading to different sets of relations. This statement is true.
Conclusion
In summary, option 'B' is false because while BCNF decomposition can be performed, it does not guarantee the preservation of all functional dependencies, making it a misleading assertion. Understanding these nuances is essential for effective database design and normalization.
When discussing database normalization, particularly in the context of BCNF (Boyce-Codd Normal Form), each statement regarding decomposition has implications for data integrity and dependency preservation. Let's analyze why option 'B' is considered false.
Statement Breakdown
- a) Decomposition into 3NF:
- Any relation can be decomposed into a set of relations that are in Third Normal Form (3NF). This decomposition is guaranteed to be lossless and preserves dependencies. This statement is true.
- b) Decomposition into BCNF:
- While it is true that any relation can be decomposed into BCNF, the claim that this decomposition always preserves dependencies is false. In some cases, decomposing a relation into BCNF may lead to a loss of certain functional dependencies, thus violating dependency preservation. Therefore, this statement is misleading.
- c) Inter-relational join constraints:
- The decomposition process using BCNF may indeed result in inter-relational join constraints, which are necessary to maintain the relationships between decomposed relations. This statement is true.
- d) Uniqueness of BCNF decomposition:
- A decomposition of a relation into BCNF is not unique. There can be multiple ways to achieve BCNF for the same relation, leading to different sets of relations. This statement is true.
Conclusion
In summary, option 'B' is false because while BCNF decomposition can be performed, it does not guarantee the preservation of all functional dependencies, making it a misleading assertion. Understanding these nuances is essential for effective database design and normalization.
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Which of the following statement is false?a)Any relation can be decomposed into a number of relations that are in third normal form, such decomposition is lossless and preserves the dependencies.b)Anyrelation can be decomposed losslesslyinto relations in BCNF and decomposition into BCNF always preserve dependency.c)The decomposition approach usingthe BCNF may produce inter-relational join constraints.d)A decomposition of relation, into BCNF is not unique.Correct answer is option 'B'. Can you explain this answer?
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