An ERD diagram and a relational database diagram are similar in that both allow relationships to have attributes.

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In an ERD (Entity-Relationship Diagram), relationships can have attributes to provide more details about the association between entities. However, in a relational database diagram, which represents the schema of a relational database, relationships are typically implemented through foreign keys and do not directly have attributes; instead, attributes are associated with entities (tables).

An ERD Diagram and a Relational Database Diagram Are Similar