- AName
- BStreet
- CId
- DDepartment
Keys in DBMS MCQ - Quiz
- ANo proper subset is a super key
- BAll subsets are super keys
- CSubset is a super key
- DEach subset is a super key
- ANAME
- BID
- CCITY
- DCITY , ID
- ACandidate key
- BSub key
- CSuper key
- DForeign key
- AReferential relation
- BReferencing relation
- CReferenced relation
- DReferred relation
- AReferential relation
- BReferencing relation
- CReferenced relation
- DReferred relation
- AId
- BRegister number
- CDept_id
- DStreet
- ALock timeout
- BWait-wound
- CTimeout
- DWait
Results:
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🟢 Correct Answers: 🔴 Wrong Answers:
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Quiz Analytics
Keys in DBMS MCQ - Quiz
Guest User
Time Taken: Questions: Answered: Not Answered:
Correct Answer:
Wrong Answer:
Percentage: %
- A. Name
- B. Street
- C. Id
- D. Department
Remarks:
Explanation: The attributes name, street, and department can repeat for some tuples. But the id attribute has to be unique.So it forms a primary key.
- A. Rows
- B. Key
- C. Attribute
- D. Fields
Remarks:
Explanation: Key is the constraint which specifies uniqueness.
- A. No proper subset is a super key
- B. All subsets are super keys
- C. Subset is a super key
- D. Each subset is a super key
Remarks:
Explanation: The subset of a set cannot be the same set.Candidate key is a set from a super key which cannot be the whole of the super set
- A. NAME
- B. ID
- C. CITY
- D. CITY , ID
Remarks:
Explanation: Here the id is the only attribute which can be taken as a key. Other attributes are not uniquely identified.
- A. Candidate key
- B. Sub key
- C. Super key
- D. Foreign key
Remarks:
Explanation: Super key is the superset of all the keys in a relation.
- A. Referential relation
- B. Referencing relation
- C. Referenced relation
- D. Referred relation
Remarks:
Explanation: Referenced relation
- A. Referential relation
- B. Referencing relation
- C. Referenced relation
- D. Referred relation
Remarks:
Explanation: Referencing relation
- A. Candidate
- B. Primary
- C. Super
- D. Sub
Remarks:
Explanation: The primary key has to be referred in the other relation to form a foreign key in that relation.
- A. Id
- B. Register number
- C. Dept_id
- D. Street
Remarks:
Explanation: Street is the only attribute which can occur more than once.
- A. Lock timeout
- B. Wait-wound
- C. Timeout
- D. Wait
Remarks:
Explanation: The timeout scheme is particularly easy to implement, and works well if transactions are short and if longwaits are likely to be due to deadlocks.