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Nick Leeman
2021-10-25 17:01:27 +02:00
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School/Development/Foreign Key.md Normal file
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# Foreign Key
A Foreign key is a [[Constraint]] that protects links between tables.

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School/Development/Primary Key.md
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@@ -3,9 +3,6 @@ A Primary key is a [[Constraint]] that uniquely identifies [[SQL Database#Entity
There can only be ONE primary per table and can consist of multiple attributes (columns).
A primary key is **not** required, but highly advised. Even if you don't use it its better to include one in your scheme.
There als o
A primary key is **not** required, but highly advised. Even if you don't use it its better to include one in your schema.