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61.
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
4. Name: Name of student
5. Hostel_Room: Room number of the hostel
Which of the following options is INCORRECT? [1 mark]
(A) BankAccount_Num is a candidate key
(B) Registration_Num 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
last reply by
CpjJwWHV
•
13 years ago
•
asked in
Computer Science And Engineering, 2011
View Comments [1 Reply]
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