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What are database diagrams? Why are database diagrams used? What is an Entity Relationship Diagram ( ERD; see the comments I left under Special note

What are database diagrams?

Why are database diagrams used?

What is an Entity Relationship Diagram

(

ERD; see the comments I left under "Special note"

) ?

What tools can be used to create an ERD?

What are the symbols used in an ERD?

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