This kind of entity is referred to as a recursive entity. It can also have a relationship with itself. A weak entity is an entity that is based on the existence of some other entity.
Click the below links if you need to learn something specific about ER diagrams. Second, ER diagrams are easily translatable into relational tables which may be utilized to rapidly build databases. First, they are easy to understand and do not require a person to undergo extensive training to be able to work with it efficiently and accurately. Initially appearance, an ER diagram appears very much like the flowchart. Last, ER diagrams could be applied in different contexts like describing the different relationships and operations in an organization.
Entities participate in relationships. In truth, it could indicate that two entities actually belong in precisely the same table. It is possible to enter as many entities as you want to map here.
Relationship is just an association among a few entities. If a relationship has a key at every endpoint, it’s a one-to-one relationship. Drop the nation table on the canvas and immediately you should observe the association between the nation table and the city table.