Entity-Relationship (ER) Model

Entity-Relationship (ER) Model

• Entity-relationship model is a model used for design and representation of relationships between data.

• Entity and Entity Set

• Attributes

• Keys

• Relationships

Entity

• A real-world object which has characteristics and holds relationships in a DBMS.

Entity Set

• The complete datasets of an Entity is the Entity Set.

Weak Entity

• An entity that depends on another entity called a weak entity.