The logical model is built on sets of data. For a more in-depth explanation of the ER model, visit the ITS Database Services Web site or the Mapping an ER Model to the Relational Model Web site (a ...

A classic example is an Order Line. An Order Line is dependent on the Order existing first. This is often represented in a logical data model by the primary key of the Order Line being a composite key ...

What does EVERYTHING mean? As the answers to these questions are unraveled, the data model arises. Your data model is a creature built of logic and as such is something that can be easily digested by ...