The relationship between the data is more important than the data.
—James Burke
Data matures like wine, applications like fish.
—James Governor
Chapter 2 introduced logical data modeling using the entity-relationship approach. This chapter expands the logical data model building blocks: relationships, entities, and attributes.
More About Relationships
Relationships, so far, seem rather pale and lifeless. However, relationships have three characteristics that give them the texture needed to express the richness of the real world, namely, membership class, degree, and relationship ...
