This Library ER Diagram Example is a large database; the entity-relationship diagram illustrates the relationships between various entities and attributes. This aids in streamlining the items required for a specific Library management system. As seen in this example, the entities and their features are present. At the same time, the direct relationships between the attributes are shown, such as the presence of several CDs and books, each with its ISBN and ISSN. One important aspect to grasp here is that proper symbols are used to comprehend an entity diagram. Here's a simple ER diagram for the Library Management System. The entity relations are visible, and their attributes are also visual.