This SQL ER Diagram Modeling represents an Entity-Relationship model. It is an abstract data model. This model defines the data elements and relationships for a given system. It creates the database's conceptual design. It also makes a very simple and easy-to-design data view. The database structure is depicted as an entity-relationship diagram in ER modeling. Assume we're creating a school database. The student will be an entity in this database, with attributes such as an address, name, id, age, and so on. There will be a relationship between the address and another entity with features such as city, street name, pin code, etc.