Classic Relationships
PizzaOrder
Topping
PizzaSize
N-N
N-1
PizzaOrder
Topping
PizzaSize
0..*
0..*
0..*
E-R diagram
UML class diagram or entity model: no big
diamonds, type of relationship is inferred from
cardinality markings
A PizzaOrder has a PizzaSize and a set of Toppings
17
1