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gate-cse-2011-->View question

Consider a relational table with a single record for each registered student with the following attributes. -gate-cse-2011

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 
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


Asked On2017-07-03 08:57:37 by:prajwalamv

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Answers
A.BankAccount_Num is candidate key
Explanation: In case two students hold joint account then BankAccount_Num will not uniquely determine other attributes.

Answerd on:2017-07-04 Answerd By:Aparna-Dasgupta

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