An entity-relationship (ER) diagram is a graphical representation of entities and their relationships to each other. It is typically used in computing in regard to the organization of data within databases or information systems.
In general, the boxes represent database tables (an entity) and the ovals represent fields in that table (attributes of the entity).
In general, the boxes represent database tables (an entity) and the ovals represent fields in that table (attributes of the entity).
Simple ER diagram modeling students and courses they are enrolled in
Complex ER diagram modeling an airline reservation system
