Chapter 5, Problem 1PSE

Program Plan Intro

Data Model:

Data modeling is the process of creating the model for the data entities involved in the business system and their relationship between them.

• Entities may represent the physical object, event, or concept.
• An attribute is a property of an entity.
• Relationship denotes the link between the entities.
• Cardinality represents the relationship between entities through three relationships such as,
  • 1:1 (one to one)
  • 1:N (one to many)
  • M:N (many to many)

Entity relationship diagram:

The entity-relationship diagram is a graphical demonstration of entity-relationship model.

• A logical representation of business data for a business area is the entity-relationship model (E-R model).
  • In the business environment, the E-R model is expressed in terms of entities and relationships between the entities.