Another standardized notation for ER diagrams is Crow's foot notation. This notation is popular when creating conceptual data models of information systems. Chen's notation for ERD supposes the use of rectangles (boxes) to represent entities and diamonds to depict relationships between first-class objects. For ERDs construction are used three basic elements: entities, attributes, and relationships. Entity Relationship Diagram (aka ER Diagram, E-R Diagram, ERD) is a time-tested and widespread software development and software engineering method for data modeling, illustrating the logical structure of databases and system design.
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