Following is a simple ER diagram illustrating the various elements involved inside a typical ER diagram. The diagram can prove extremely helpful when creating your own ER diagram from scratch. The various elements involved include the entity represented using a square box, weak entity represented using a double-lined square box, attributes represented using oval-like shapes, key attributes represented using an underline below the attribute name, weak key attributes represented using an underline as well as a dotted oval shape, a strong relationship represented using diamond-like shape and weak relationship represented using double lined diamond shape
