* si on a aucune propriété de clé étrangère, une shadow property est créée avec le nom ```<navigationPropertyName><principalKeyPropertyName>``` ou ```<principalEntityName><principalKeyPropertyName>```.
* Single Property Navigation vs. Pair Navigation Property
* Cascade Delete
* ex01: single navigation property (conventions & data annotations)
* ex02: single navigation property (fluent api)
* ex03: one to one (conventions & data annotations)
* ex04: one to one (fluent api)
* ex05: one to many (conventions & data annotations)
* ex06: one to many (fluent api)
* ex07: many to many (conventions & data annotations)