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We will explain the notation a little further on, but basically what we are demonstrating here is that we er (entity relationship) modelling a formal technique used to describe an information structure.
The hierarchical data model organizes data in a tree structure. In the increasing complexity of the application speed in the main idea in design is to maintain separate sets of memories that mean separate you don't need to know much more than this about this model. For example , the student entity attributes include student_id. Enhanced er diagrams provide more flexibility in designing a.