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Consider a relational table with a single record for each registered student with the following attributes.
1. Registration_Number: Unique registration number for each registered student
2. UID: Unique Identity number, unique at the national level for each citizen
3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number
4. Name: Name of the Student
5. Hostel_Room: Room number of the hostel
Q. Which of the following options is INCORRECT?
- a)BankAccount_Number is a candidate key
- b)Registration_Number can be a primary key
- c)UID is a candidate key if all students are from the same country
- d)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkey
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider a relational table with a single record for each registered s...
In case two students hold joint account then BankAccount_Num will not uniquely determine other attributes.
Most Upvoted Answer
Consider a relational table with a single record for each registered s...
Explanation:
Let's analyze each option one by one to determine which one is incorrect.
a) BankAccount_Number is a candidate key:
A candidate key is a minimal set of attributes that can uniquely identify a tuple (record) in a relation (table). In this case, the BankAccount_Number attribute is not a candidate key because a student can have multiple accounts or joint accounts. Therefore, there can be multiple records with the same BankAccount_Number. Hence, option 'a' is incorrect.
b) Registration_Number can be a primary key:
A primary key is a candidate key that is chosen as the main identifier for a relation. The Registration_Number attribute is unique for each registered student, and hence it can be a primary key for the table. Therefore, option 'b' is correct.
c) UID is a candidate key if all students are from the same country:
A candidate key is a minimal set of attributes that can uniquely identify a tuple (record) in a relation (table). The UID attribute is unique at the national level for each citizen, which means it can uniquely identify a student within the context of the country. Therefore, if all students in the table are from the same country, the UID attribute can be considered a candidate key. Therefore, option 'c' is correct.
d) If S is a superkey such that S + UID is NULL then S + UID is also a superkey:
A superkey is a set of attributes that can uniquely identify a tuple (record) in a relation (table). If S is a superkey and S + UID is NULL, it means that the combination of attributes S and UID uniquely identifies a tuple even if the value of UID is NULL. In this case, the combination of attributes S and UID is still a superkey because it can uniquely identify a tuple. Therefore, option 'd' is correct.
Conclusion:
Based on the analysis, option 'a' is incorrect because the BankAccount_Number attribute is not a candidate key.
Let's analyze each option one by one to determine which one is incorrect.
a) BankAccount_Number is a candidate key:
A candidate key is a minimal set of attributes that can uniquely identify a tuple (record) in a relation (table). In this case, the BankAccount_Number attribute is not a candidate key because a student can have multiple accounts or joint accounts. Therefore, there can be multiple records with the same BankAccount_Number. Hence, option 'a' is incorrect.
b) Registration_Number can be a primary key:
A primary key is a candidate key that is chosen as the main identifier for a relation. The Registration_Number attribute is unique for each registered student, and hence it can be a primary key for the table. Therefore, option 'b' is correct.
c) UID is a candidate key if all students are from the same country:
A candidate key is a minimal set of attributes that can uniquely identify a tuple (record) in a relation (table). The UID attribute is unique at the national level for each citizen, which means it can uniquely identify a student within the context of the country. Therefore, if all students in the table are from the same country, the UID attribute can be considered a candidate key. Therefore, option 'c' is correct.
d) If S is a superkey such that S + UID is NULL then S + UID is also a superkey:
A superkey is a set of attributes that can uniquely identify a tuple (record) in a relation (table). If S is a superkey and S + UID is NULL, it means that the combination of attributes S and UID uniquely identifies a tuple even if the value of UID is NULL. In this case, the combination of attributes S and UID is still a superkey because it can uniquely identify a tuple. Therefore, option 'd' is correct.
Conclusion:
Based on the analysis, option 'a' is incorrect because the BankAccount_Number attribute is not a candidate key.
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Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer?
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Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. 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 a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. 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 a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer?.
Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. 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 a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. 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 a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. 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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Here you can find the meaning of Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect 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 with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider a relational table with a single record for each registered student with the following attributes.1. Registration_Number: Unique registration number for each registered student2. UID: Unique Identity number, unique at the national level for each citizen3. BankAccount_Number: Unique account number at the bank. A student can have multiple accounts or joint accounts. This attributes stores the primary account number4. Name: Name of the Student5. Hostel_Room: Room number of the hostelQ.Which of the following options is INCORRECT?a)BankAccount_Number is a candidate keyb)Registration_Number can be a primary keyc)UID is a candidate key if all students are from the same countryd)If S is a superkey such that S ∩ UID is NULL then S ∪ UID is also a superkeyCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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