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Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:
- a)(a) and (b) are true.
- b)(a) and (c) are true.
- c)(b) and (c) are true.
- d)(a), (b) and (c) are true.
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements regarding relational database model:...
IN relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key.Correct (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF.Correct (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all.Correct So, option (D) is correct.
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Consider the following statements regarding relational database model:...
A) TRUE - NULL values can be used to opt a tuple out of enforcement of a foreign key. In a relational database, a foreign key is a field or combination of fields that refers to the primary key of another table. By assigning NULL to a foreign key field, the tuple is not required to have a matching value in the referenced table.
b) FALSE - If table T has only one candidate key and Q is in 3NF (Third Normal Form), it does not necessarily mean that it is also in BCNF (Boyce-Codd Normal Form). BCNF is a stricter normalization form that requires all non-trivial functional dependencies in a table to be determined by a candidate key. 3NF only eliminates transitive dependencies, but it may still have non-trivial functional dependencies that violate BCNF.
c) The project operator is used to select specific columns (attributes) from a relation (table), while the difference operator is used to find the tuples that are in one relation but not in another. These two operators have different purposes and functionalities, so there is no direct comparison or difference between them.
b) FALSE - If table T has only one candidate key and Q is in 3NF (Third Normal Form), it does not necessarily mean that it is also in BCNF (Boyce-Codd Normal Form). BCNF is a stricter normalization form that requires all non-trivial functional dependencies in a table to be determined by a candidate key. 3NF only eliminates transitive dependencies, but it may still have non-trivial functional dependencies that violate BCNF.
c) The project operator is used to select specific columns (attributes) from a relation (table), while the difference operator is used to find the tuples that are in one relation but not in another. These two operators have different purposes and functionalities, so there is no direct comparison or difference between them.
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Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer?.
Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer?.
Solutions for Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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ample number of questions to practice Consider the following statements regarding relational database model: (a) NULL values can be used to opt a tuple out of enforcement of a foreign key. (b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF. (c) The difference between the project operator (Π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then Π will return only one of them, while SQL SELECT will return all. One can determine that:a)(a) and (b) are true.b)(a) and (c) are true.c)(b) and (c) are true.d)(a), (b) and (c) are true.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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