Entity Relationship Diagrams are supported in the Corporate, Business and Software Engineering, Systems Engineering and Ultimate editions of Enterprise Architect.
For further information on the concepts of Entity Relationship Diagrams, refer to the Wikipedia item and its linked sources.
Entity Relationship Diagrams in Enterprise Architect are based on Chen's ERD building blocks: entities are represented as rectangles, attributes are represented as ellipses and relationships are represented as diamond-shape connectors.
Enterprise Architect enables you to develop Entity Relationship diagrams quickly and simply, through use of an MDG Technology integrated with the Enterprise Architect installer. Entity Relationship element and relationship entries in the Toolbox Shortcut Menu and Quick Linker.
Enterprise Architect also provides transformation templates to transform Entity Relationship Diagrams into Data Modeling Diagrams, and vice versa. N-ary Association represents unary (many-to-many recursive) or ternary relationships and can also be used to represent relationships that have attributes among the entities; Note that the N-ary Association element should always be at the target end of a connector.
Relationship is a diamond-shape connector, representing the meaningful association among entities.

Disjoint and Overlapping represent the relationships between the super-class Entity and the sub-class Entity. For one-to-many and one-to-one recursive relationships, we suggest using the normal Relationship connector. Sometimes you might want to limit the stretch of the diamond-shape Relationship connectors. The material ("material" includes all pages, documents and on-line graphics) on this web site is protected by copyright law. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion. ERD technology in Enterprise Architect assists you in every stage from building conceptual data models to generating Data Definition Language (DDL) for the target DBMS.
The property of Multiplicity in the SourceRole and TargetRole definitions for the Relationship connector (below) can be used to define the cardinality of an Entity that participates in this relationship. Simply pick a Relationship connector, right-click to display the context menu, and  select the Bend Line at Cursor option.

The entity-relationship model will be based upon a perception of the real world that includes a collection of essential objects, called agencies, and of associations among these items. Diagrams created by this process are called Entity-Relationship Diagrams, ER Diagrams, or ERDs.
The set of all entities of identical type are classified an entity set, and the list of all relationships with the same type are termed as a relationship set.
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