Entity Relationship Diagram Example: UPS System


ER diagrams can be used to show the entities to be created in physical database. Here is an ERD that shows the entities involved in UPS system. It consists of entities like retail center, shipped item, transportation event, etc.

Use this ER diagram template to get started building your own. Customize the ER diagram to reflect the objects of your problem. Click Use this Template to start.

What is ER Diagram?

An entity relationship diagram (also known as ER model or ER diagram in short) describes interrelated things of interest in a specific domain of knowledge. An ER diagram is usually the result of systematic analysis to define and describe what is important to processes in an area of a business. It does not define the business processes; it only presents a business data schema in graphical form. It is usually drawn in a graphical form as entities that are connected by relationships which express the associations and dependencies between entities.

Steps in designing an Entity-Relationship schema

  • Identify entity types (entity type vs. attribute)
  • Identify relationship types
  • Identify and associate attributes with entity and relationship types
  • Determine attribute domains
  • Determine primary key attributes for entity types
  • Associate (refined) cardinality ratio(s) with relationship types
  • Design generalization /specialization hierarchies including constraints

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