- 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
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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
- B. Referencing
- C. Specific
- D. Primary
Remarks:
Explanation: A relation, say r1, may include among its attributes the primary key of another relation, say r2. This attribute is called a foreign key from r1, referencing r2. The relation r1 is also called the referencing relation of the foreign key dependency, and r2 is called the referenced relation of the foreign key.
- 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.