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Cardinality of Relationships

Many to Many

Sometimes Abbreviated m-n to highlight that m and n are not the same

Many to One

Abbreviated n-1

One to Many

Abbreviated 1-n

One to One

Abbreviated 1-1

https://www.youtube.com/watch?v=PNCfDV2EL_o

https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model#Crow.27s_foot_notation