One-to-One Relationship in DBMS

Relationships in DBMS can be stated as a relation between two entities like Employee-Department, Student-Course, etc.

One-to-One relationship in DBMS is a relationship between an instance of an entity with another.

The relation can be stated as −

An Employee is issued an Employee ID Card. An individual employee is offered a unique ID card in the company. 

Here, Employee and ID Card (ID_Card) are entities.