2.5 DEFINE RELATIONSHIPS 2.5.1 Connectivity Connectivity refers to the types of relationships that entities can have. Basically, the relationship can be one-to-one, one-to-many and many-to-many. In ER diagrams, these are indicated by placing 1, M orN at one of the two ends of the relationship diagram. Figures 2.2–2.5 illustrate the […]