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Consider the following statements S1 and S2 about the relational data model:
S1: A relation scheme can have at most one foreign key.
S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.
S1: A relation scheme can have at most one foreign key.
S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.
Which one of the following choices is correct?
- a)S1 is true and S2 is false.
- b)Both S1 and S2 are true.
- c)Both S1 and S2 are false.
- d)S1 is false and S2 is true.
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Consider the following statements S1 and S2 about the relational data ...
Concept:
Foreign Key :is the set of attributes in a particular relation whose values are belongs to primary key of same relation or other relation.
Foreign Key :is the set of attributes in a particular relation whose values are belongs to primary key of same relation or other relation.
Statement 1: A relation scheme can have at most one foreign key.
There is no such restriction on how many number of Foreign keys a particular relation can have. A relation can have as many number of Foreign keys as Required.
So this statement is false.
There is no such restriction on how many number of Foreign keys a particular relation can have. A relation can have as many number of Foreign keys as Required.
So this statement is false.
Statement 2: foreign key in a relation scheme R cannot be used to refer to tuples of R.
There is no such constraint. Foreign key can be used to refer to primary key of the same relation. Self-referencing relations are examples of such foreign key. So this statement is also false.
So option 3 is the correct answer.
There is no such constraint. Foreign key can be used to refer to primary key of the same relation. Self-referencing relations are examples of such foreign key. So this statement is also false.
So option 3 is the correct answer.
Most Upvoted Answer
Consider the following statements S1 and S2 about the relational data ...
Explanation:
Statement S1:
- A relation scheme can have multiple foreign keys, not just one. This is because a foreign key is a field (or collection of fields) in one table that refers to the primary key in another table.
- Therefore, statement S1 is false.
Statement S2:
- A foreign key in a relation scheme R can indeed be used to refer to tuples of R. This is the fundamental concept of referential integrity in the relational data model, where foreign keys establish relationships between tables.
- Therefore, statement S2 is also false.
Conclusion:
- Since both statements are false, the correct choice is option 'c) Both S1 and S2 are false'.
Statement S1:
- A relation scheme can have multiple foreign keys, not just one. This is because a foreign key is a field (or collection of fields) in one table that refers to the primary key in another table.
- Therefore, statement S1 is false.
Statement S2:
- A foreign key in a relation scheme R can indeed be used to refer to tuples of R. This is the fundamental concept of referential integrity in the relational data model, where foreign keys establish relationships between tables.
- Therefore, statement S2 is also false.
Conclusion:
- Since both statements are false, the correct choice is option 'c) Both S1 and S2 are false'.
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Consider the following statements S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. 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 S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. 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 S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. Can you explain this answer?.
Consider the following statements S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. 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 S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. 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 S1 and S2 about the relational data model:S1: A relation scheme can have at most one foreign key.S2: A foreign key in a relation scheme R cannot be used to refer to tuples of R.Which one of the following choices is correct?a)S1 is true and S2 is false. b)Both S1 and S2 are true. c)Both S1 and S2 are false. d)S1 is false and S2 is true.Correct answer is option 'C'. Can you explain this answer?.
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