We can easily create a data model of an existing database schema using the Toad Data Modeler Reverse Engineering wizard and then using the Convert Model Wizard to convert that model to another database platform.
For this demonstration I have a schema called quest in an Oracle 11g R2 database; below we can see its data model.
Figure 1. Data model for our example schema

Reverse Engineering Wizard

Before using the wizard that will allow us to create the data model of the existing database, it’s very important to know which database systems are supported by the Reverse Engineering tool.
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