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Data Modeling with ER Model
An entity is something that can be identified in the user's work environment; something that the users want to track.
True
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True
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Data Modeling with ER Model
An identifier typically uses more than one attribute.
Relationship classes are associations between entity classes.
Entity instances are associated by relationship classes.
Composite identifiers consist of two or more attributes.
All instances of an entity class have the same attributes.
A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
Entities use identifiers while tables use keys.
1:1, 1:N and N:M relationships are also known as HAS-A relationships.
An attribute describes the entity's characteristics.
The degree of a relationship refers to the number of entity classes in the relationship.
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