What geometric symbol is used in an Entity-Relationship (ER) diagram to represent a relationship between entities? MCQ with Answer and Explanation

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What geometric symbol is used in an Entity-Relationship (ER) diagram to represent a relationship between entities?

A. Oval

B. Diamond

C. Circle

D. Rectangle

Answer: Option B

Solution (By JKSSB Mock Tests)

Diamonds are utilized in ER diagrams to depict relationships between two or more entities.

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

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Practice More Database Management System (DBMS) Questions

Question #1

What does the EXISTS operator do in SQL?

A. Performs arithmetic

B. Compares two values

C. Tests for the existence of rows returned by a subquery

D. Checks if a value is null

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Correct Answer: Option C

Explanation:
EXISTS returns TRUE if the subquery returns at least one row, otherwise FALSE.

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

Question #2

What is the purpose of the COMMIT statement in SQL?

A. To start a new transaction

B. To save a point within a transaction

C. To permanently save all changes made in a transaction

D. To undo all changes made in a transaction

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Correct Answer: Option C

Explanation:
COMMIT finalizes a transaction, making all changes permanent in the database.

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

Question #3

Which of the following is a purpose of a database management system?

A. All of the above

B. To manipulate data

C. To define and create databases

D. To control access to data

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Correct Answer: Option A

Explanation:
A DBMS provides functionalities for defining, constructing, manipulating, and controlling access to databases.

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

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