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The Entity-Relationship (ER) model is a conceptual data model used in software engineering to represent the structure of data in a high-level or conceptual view. It provides a straightforward way to visualize and understand the design of a database at a high level, without delving into the actual database schema details. |
Here are the main components of an ER model:
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An ER diagram (ERD) is a graphical representation of an ER model. It uses shapes to represent entities, and lines to represent the relationships between them.
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ER models and ERDs are very useful in the design process of databases, as they provide a clear picture of the structure of the data and how it should be stored, which can then be translated into a relational schema when creating the actual database.