Question:
What is the notation for class hierarchies in ER diagrams?
What is the notation for class hierarchies in ER diagrams?
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Rectangle = Entity
Diamond (Rhombus) = Relationship
Triangle = Generalization/Specialization
Updated On: Jun 25, 2026
- Rectangle
- Double rectangle
- Triangle
- Rhombus
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The Correct Option is C
Solution and Explanation
Concept:
Enhanced ER (EER) diagrams support specialization and generalization.
These concepts create class hierarchies among entities.
Step 1: Understand specialization and generalization.
A superclass can be divided into subclasses. Example: \[ \text{Employee} \rightarrow \text{Teacher, Clerk, Manager} \]
Step 2: Notation used in EER diagrams.
The hierarchy is represented using a triangle symbol. The triangle connects the superclass with its subclasses.
Step 3: Select the answer.
Hence, \[ \boxed{\text{Triangle}} \] represents class hierarchies.
Step 1: Understand specialization and generalization.
A superclass can be divided into subclasses. Example: \[ \text{Employee} \rightarrow \text{Teacher, Clerk, Manager} \]
Step 2: Notation used in EER diagrams.
The hierarchy is represented using a triangle symbol. The triangle connects the superclass with its subclasses.
Step 3: Select the answer.
Hence, \[ \boxed{\text{Triangle}} \] represents class hierarchies.
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