All of the symbols shown below are found in the UML Entity Relationship and Entity Relationship shape library of Lucidchart.

ER Diagrams are composed of entities, relationships, and attributes.

The basic entity-graph consists of entities, attributes and relationships.

ER Diagrams are composed of entities, relationships and attributes.

There are three types of entities commonly used in entity relationship diagrams.

Every BPMN shape has some underlying data, or attributes.

Conceptual ERDs can be used as the foundation for logical data models.

ER components can be equated to parts of speech, as Peter Chen did.

In software engineering, an ER diagram is often an initial step in determining requirements for an information systems project.

ER models and data models are typically drawn at up to three levels of detail:

Since then Charles Bachman and James Martin have added some slight refinements to the basic ERD principles.

In one aspect, components types are implement that allow entity relationships to be added and/or edited in a flow view of a logical design.

ER diagrams are related to data structure diagrams (DSDs), which focus on the relationships of elements within entities instead of relationships between entities themselves.

To add multiplicities or reverse line direction for ERD or UML lines, select a line by clicking on it.

ERROL is based on reshaped relational algebra (RRA) and works with ER models, capturing their linguistic aspects.