A conceptual data diagram provides a graphical view of the conceptual structure of an information system, and helps you identify the principal entities to be represented, their attributes, and the relationships between them.
To create a conceptual diagram in an existing CDM, right-click the model in the Browser and select . To create a new model, select Conceptual Data Model , chooseas the model type and Conceptual Diagram as the first diagram, and then click OK.
In the following conceptual diagram, the Teacher and Student entities inherit attributes from the Person parent entity. The two child entities are linked with a one-to-many relationship (a teacher has several students but each student has only one main teacher).
In addition:
a teacher can teach several subjects and a subject can be taught by several teachers (many-to-many).
a teacher can teach several lessons and a lesson is taught by only one teacher (one-to-many).
a student attends multiple lessons and a lesson is followed by multiple students (many-to-many).
a student studies multiple subjects and a subject can be studied by multiple students (many-to-many).