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What does the term 'cardinality' refer to in an ER model?
What does the term 'cardinality' refer to in an ER model?
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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
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Cardinality refers to the number of entities involved in a relationship.
Questions & Step-by-step Solutions
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Q
Q: What does the term 'cardinality' refer to in an ER model?
Solution:
Cardinality refers to the number of entities involved in a relationship.
Steps: 6
Show Steps
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.
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