Question: What does the term \'cardinality\' refer to in an ER model?
Options:
The number of attributes in an entity
The number of entities in a relationship
The type of data stored in an entity
The uniqueness of an entity
Correct Answer: The number of entities in a relationship
Solution:
Cardinality refers to the number of entities involved in a relationship.
What does the term 'cardinality' refer to in an ER model?
Practice Questions
Q1
What does the term 'cardinality' refer to in an ER model?
The number of attributes in an entity
The number of entities in a relationship
The type of data stored in an entity
The uniqueness of an entity
Questions & Step-by-Step Solutions
What does the term 'cardinality' refer to in an ER model?
Correct Answer: Cardinality refers to the number of entities involved in a relationship.
Step 1: Understand that an ER model is a way to represent data and relationships in a database.
Step 2: Know that entities are objects or things in the database, like 'Student' or 'Course'.
Step 3: Recognize that a relationship connects two or more entities, like 'enrolls in' between 'Student' and 'Course'.
Step 4: Learn that cardinality tells us how many entities are involved in that relationship.
Step 5: Identify the types of cardinality: one-to-one, one-to-many, and many-to-many.
Step 6: Conclude that cardinality helps us understand how entities interact with each other in the database.
Cardinality in ER Models – Cardinality defines the numerical relationships between entities in an Entity-Relationship model, indicating how many instances of one entity relate to instances of another.
Soulshift Feedback×
On a scale of 0–10, how likely are you to recommend
The Soulshift Academy?
