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Entity relationship diagram treats the real world as entities. It was proposed by P.P.Chen in 1976 and is known as ER diagram, ER model, etc.
The importance of entity relationship diagrams is explained below -
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ER diagrams can help with design before you even start building tables.
This helps the user plan how to organize the data.
ER diagram can be used as a document to let others understand the core of the database.
It conveys the logical structure of the database to the user.
The ER diagram is considered the blueprint of the database.
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