Attributes

Attributes are the data for a particular Entity.

Types of Attributes

• Simple Attribute

• Composite Attribute

• Stored Attribute

• Derived Attribute

• Single-valued Attribute

• Multi-valued Attribute

• Key Attribute

• Attribute Domain

Simple Attribute

• Simple attributes are atomic and cannot be broken down further pieces.

Composite Attribute

• A composite attribute is made up of more than one simple attribute.

Stored Attribute

• Attribute directly stored in the database.

Derived Attribute

• Derived attribute is not directly present in the database, it is derived using other attributes.

Single-valued Attribute

• Single valued attribute has only one possible value in the database for an Entity.

Multi-valued Attribute

• Multi valued attribute has two or more possible value in the database for an Entity.

Key Attribute

• The key attribute is used to represent the main characteristics of an entity. It represents a primary key.