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Cardinality

One to One
One to Many

Sales
Key	Field	Type
PK	TID
	TDate
	TAmt
	TClrk
FK	CNumb
FK	PNumb

Product
Key	Field	Type
PK	PNumb
	PName
	PInvt
	PCost

Customer
Key	Field	Type
PK	CNumb
	CName

Many to One
Many to Many

A Customer (1) can come to the store and by things more than once (Many)