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1.	Entities use identifiers while tables use keys.
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Entity instances are associated by relationship classes.
A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
A recursive relationship is a relationship between an archetype and an instance of that archetype.
Entities use identifiers while tables use keys.
Relationship classes are associations between entity classes.
When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.
A subtype entity is a special case of another entity called a supertype entity.
1:1, 1:N and N:M relationships are also known as HAS-A relationships.
An identifier typically uses more than one attribute.
Composite identifiers consist of two or more attributes.

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