ermodel.htm; updated 1/23/01

Entity-Relationship Modeling

MODELING IN GENERAL.

ENTITY-RELATIONSHIP MODEL - BASICS.
  Entity.
Attribute.

Simple Vs. Composite Attributes.

Stored Vs. Derived Attributes. Entity Type - Entity Instance. Multivalued Attribute. Candidate Key. Primary Key Attribute.
RELATIONSHIPS.

Binary Relationships.

Maximum Cardinality.





Unary Relationships


Ternary Relationships.





Gerund or Associative Entity.





Minimum Cardinality.

Existence Dependency (Strong vs. Weak Entity). Multivalued Attributes. Repeating Groups (Multivalued Attribute Sets).


Modeling Time Dependent Data.

Multiple Relationships.

END OF NOTES.