12 Questions
What is the main purpose of the Entity-Relationship Model (ER Model)?
To represent the structure and relationships of entities within a system
In the Entity-Relationship Model (ER Model), what are entities?
Objects or concepts within a system worth storing data about
What are attributes in the context of the Entity-Relationship Model (ER Model)?
Properties or characteristics of an entity
Why are primary keys important in the context of entities?
They uniquely identify each entity
What do relationships establish in the Entity-Relationship Model (ER Model)?
Connections between entities
What benefits does the Entity-Relationship Model (ER Model) offer?
Improved data organization, enhanced data integrity, efficient database design, and simplified database maintenance.
What do Entity Relationship Diagrams (ER Diagrams) use to represent entities?
Rectangles
In Entity Relationship Model, what does cardinality refer to?
Number of occurrences or instances of one entity that are associated with the occurrences of another entity
Which symbol represents a basic entity in ER Diagrams?
Rectangle
What does a weak entity inherit in the Entity Relationship Model?
Identifier of its parent entity
How are multi-valued attributes represented in ER Diagrams?
Double oval
What is the purpose of derived attributes in ER Diagrams?
Logically derived from any other attribute
Learn about the Entity-Relationship (E-R) Model used in database design, including its components, diagrams, symbols, and notations. Practice problems are also included in this quiz.
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