Database Design · question
Q.03 of 35
What is an Entity-Relationship (ER) model and what are its components?
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An ER model is a conceptual data model that describes the structure of a database using entities, attributes, and relationships.
Components:
Entities: Real-world objects or concepts (represented by rectangles)
- Example: Customer, Product, Order
Attributes: Properties of entities (represented by ovals)
- Example: Customer has attributes like CustomerID, Name, Email
Relationships: Associations between entities (represented by diamonds)
- Example: Customer "places" Order
Cardinality: Describes the number of instances of one entity that can be associated with another
- One-to-One (1:1): Employee has one SSN
- One-to-Many (1:M): Customer can have many Orders
- Many-to-Many (M:N): Students enrolled in Courses
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