What type of entity cannot be uniquely identified by its own attributes alone and must rely on a relationship with a parent entity? MCQ with Answer and Explanation

What type of entity cannot be uniquely identified by its own attributes alone and must rely on a relationship with a parent entity?
A. Strong Entity
B. Weak Entity
C. Associative Entity
D. Abstract Entity
Answer: Option B
Solution (By JKSSB Mock Tests)
A Weak Entity is an entity that does not possess its own primary key and depends on an identifying relationship with a strong (owner) entity.

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Practice More Database Management System (DBMS) Questions

Question #1
Candidate keys that are not selected or designated as the primary key of a table are known as what?
A. Alternate Keys
B. Super Keys
C. Foreign Keys
D. Composite Keys

Correct Answer: Option A


Explanation:
Out of all available candidate keys, the one selected to identify rows uniquely is the primary key, and the remaining unselected candidate keys are called alternate keys.

This question belongs to: Computer Database Management System (DBMS)
Question #2
What does the ROLLBACK statement do?
A. Undoes all changes made in the current transaction
B. Creates a savepoint
C. Saves the changes
D. Starts a new transaction

Correct Answer: Option A


Explanation:
ROLLBACK reverts the database to the state it was in at the beginning of the transaction, undoing all changes.

This question belongs to: Computer Database Management System (DBMS)
Question #3
Which SQL operator allows you to check if a column value matches any item contained within a comma-separated list of explicit values?
A. EXISTS
B. BETWEEN
C. LIKE
D. IN

Correct Answer: Option D


Explanation:
The IN operator allows you to specify multiple literal values or a subquery inside a WHERE clause, testing if an attribute matches any element in the list.

This question belongs to: Computer Database Management System (DBMS)