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Consider a relational table with a single record for each registered student with the following attributes.
1. Registration_Num: Unique registration number of each registered student
2. UID: Unique identity number, unique at the national level for each citizen
3. BankAccount_Num: Unique account number at the bank. A student can have multiple accounts or join accounts. This attribute stores the primary account number.
4. Name: Name of the student
5. Hostel_Room: Room number of the hostel

Q. Which one of the following option is INCORRECT?
  • a)
    BankAccount_Num is candidate key
  • b)
    Registration_Num can be a primary key
  • c)
    UID is 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?
Verified Answer
Consider a relational table with a single record for each registered s...
A Candidate Key value must uniquely identify the corresponding row in table. BankAccount_Number is not a candidate key. As per the question “A student can have multiple accounts or joint accounts. This attributes stores the primary account number”. If two students have a joint account and if the joint account is their primary account, then BankAccount_Number value cannot uniquely identify a row.
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Most Upvoted Answer
Consider a relational table with a single record for each registered s...
Explanation:

BankAccount_Num is a candidate key:
- A candidate key is a minimal superkey, meaning it uniquely identifies each tuple in a relation. In this case, BankAccount_Num is not a candidate key because a student can have multiple accounts or joint accounts, making it possible for BankAccount_Num to have duplicate values.

Registration_Num can be a primary key:
- A primary key is a candidate key chosen to uniquely identify tuples in a relation. Since Registration_Num is unique for each student, it can serve as a primary key for the table.

UID is a candidate key if all students are from the same country:
- If all students are from the same country, then UID can be considered a candidate key as it uniquely identifies each student at the national level. However, if students are from different countries, UID may not be a candidate key.

If S is a superkey such that SUID is NULL then SUID is also a superkey:
- In a relational table, a superkey is a set of attributes that uniquely identifies tuples. If S is a superkey and SUID is NULL, then SUID is also a superkey because it can uniquely identify tuples when combined with S.
Therefore, the incorrect statement is option 'A' - BankAccount_Num is 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_Num: Unique registration number of each registered student2. UID: Unique identity number, unique at the national level for each citizen3. BankAccount_Num: Unique account number at the bank. A student can have multiple accounts or join accounts. This attribute stores the primary account number.4. Name: Name of the student5. Hostel_Room: Room number of the hostelQ.Which one of the following option isINCORRECT?a)BankAccount_Num is candidate keyb)Registration_Num can be a primary keyc)UID is 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_Num: Unique registration number of each registered student2. UID: Unique identity number, unique at the national level for each citizen3. BankAccount_Num: Unique account number at the bank. A student can have multiple accounts or join accounts. This attribute stores the primary account number.4. Name: Name of the student5. Hostel_Room: Room number of the hostelQ.Which one of the following option isINCORRECT?a)BankAccount_Num is candidate keyb)Registration_Num can be a primary keyc)UID is 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_Num: Unique registration number of each registered student2. UID: Unique identity number, unique at the national level for each citizen3. BankAccount_Num: Unique account number at the bank. A student can have multiple accounts or join accounts. This attribute stores the primary account number.4. Name: Name of the student5. Hostel_Room: Room number of the hostelQ.Which one of the following option isINCORRECT?a)BankAccount_Num is candidate keyb)Registration_Num can be a primary keyc)UID is 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_Num: Unique registration number of each registered student2. UID: Unique identity number, unique at the national level for each citizen3. BankAccount_Num: Unique account number at the bank. A student can have multiple accounts or join accounts. This attribute stores the primary account number.4. Name: Name of the student5. Hostel_Room: Room number of the hostelQ.Which one of the following option isINCORRECT?a)BankAccount_Num is candidate keyb)Registration_Num can be a primary keyc)UID is 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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