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database/notes/02-integrity-er-diagram.md
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@ -197,6 +197,7 @@ A student can only have one email address and one email address can be associate
![One to One](../media/one-to-one.png)
An attribute shared by both entities can be added to either of the entities.
**One to Many or Many to one (1:m or m:1)**
> When one instance of entity 1 is related to more than one instance of entity 2, the relationship is referred to as "one-to-many.