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

Question

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. Abstract Entity

D. Associative Entity

Answer: Option B

Solution (By JKExamLibrary)

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.

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

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Question #1

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Which of the following is an example of a relational database management system (RDBMS)?

A. Oracle Database

B. Cassandra

C. MongoDB

D. Redis

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Correct Answer: Option A

Explanation:
Oracle Database is a well-known RDBMS. MongoDB, Redis, and Cassandra are NoSQL databases.

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

Question #2

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In SQL, how do you check if a value is NOT NULL?

A. != NULL

B. IS NOT NULL

C. IS NULL

D. NOT NULL

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Correct Answer: Option B

Explanation:
IS NOT NULL is the correct operator to test for non-NULL values.

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

Question #3

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Which of the following is a non-aggregate function in SQL?

A. LENGTH()

B. SUM()

C. AVG()

D. COUNT()

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Correct Answer: Option A

Explanation:
LENGTH() (or LEN()) is a string function that returns the length of a string, not an aggregate. SUM, COUNT, AVG are aggregates.

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

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