Relational Data Modeling
Now that you've successfully modeled the relationships between the entities needed to service the property leasing process, you're ready to move on to relational data modeling. Relational (or logical) data modeling is one step closer to the physical implementation of your database than E-R diagramming. Here you'll define primary keys, referential integrity constraints, and the like. Again, a CASE tool is indispensable here. A good CASE tool will not only make the task of modeling much easier, it will also generate the SQL necessary to implement your model.
Logical Data Modeling Terms
Before we get started, let me cover some basic relational database and logical data modeling jargon. Table 5-5 lists what I consider essential ...