Database Reference
In-Depth Information
Figure 5-3.
Example of Type Hierarchy
5.3 Database Design via the E-R Model
Database design with the E-R model simply involves following the rules established in
chapter 3 on implementing relationships (section 3.5.4). These rules tell you exactly
how to treat the various kinds of relationships; take some time to review them. We may
therefore construct a procedure for database design via the E-R model as follows:
Figure 5-4.
Database Design Procedure Using the E-R Model
