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School/Development/Foreign Key.md
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A Foreign key is a [[Constraint]] that protects links between tables. Foreign key is a attribute or attributes that link to the [[Primary Key]] of a other entity set (table).
## Example
Authors
|ID (PK)|Name|Age|Sex|Length|
|-----|-----|-----|-----|-----|
|1|Nick|21|M|190|
Authors
|ID (PK)|Job|Age|Sex|Length|
|-----|-----|-----|-----|-----|
|1|Nick|21|M|190|