ER diagrams use standardized symbols to represent entities, attributes, and relationships clearly.

Rectangles represent entities and serve as the primary building blocks of the diagram.

Ellipses represent attributes and describe entity properties.

Diamonds represent relationships and illustrate how entities interact.

Lines connect entities to relationships and attributes, showing their associations.

Double rectangles represent weak entities, while double ellipses represent multi-valued attributes. Dashed ellipses indicate derived attributes.

These symbols provide a universal language that allows database designers to communicate structure effectively.

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