Question

Which of the following is known as a set of entities of the same type that share same properties, or attributes?

• A. Relation set
• B. Tuples
• C. Entity set
• D. Entity Relation model

Hint:

Think of the distinction in database terminology:
- Entity $\rightarrow$ A single specific object (e.g., "John Doe").
- Entity Set $\rightarrow$ A collection of similar objects (e.g., "All Students").
- Attributes $\rightarrow$ The properties that describe the entities (e.g., "Age", "Major").

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
In database design, the Entity-Relationship (ER) model is a conceptual tool used to represent the logical structure of a database.
It uses basic building blocks such as entities, attributes, and relationships to model real-world data structures.

Step 2: Detailed Explanation:
Let us define the terms used in the options:
- Entity: An entity is a distinguishable real-world object (e.g., a specific student, a particular car, or a single employee).
- Entity Set (Option C): An entity set is a collection of entities of the same type that share the same properties or attributes.
For example, all students in a university form an entity set called "Students," where each individual student is an entity sharing attributes like ‘StudentID‘, ‘Name‘, and ‘Age‘.
- Relation Set (Option A): A relation set (or relationship set) is a set of relationships of the same type between entities.
- Tuples (Option B): In the relational model, a tuple represents a single row in a table, which corresponds to a single record or entity instance.
- Entity Relation Model (Option D): This is the overall conceptual framework used to design database structures, rather than a specific set of identical entities.

Step 3: Final Answer:
A set of entities of the same type sharing the same properties is known as an Entity set.