What type of relationship is exemplified in a student document containing a unique studentId?

In a scenario where a student document contains a unique studentId, this exemplifies a one-to-one relationship. Each student document is individually identified by its unique studentId, indicating that there is a direct correlation between that specific studentId and a singular set of student attributes.

In a one-to-one relationship, for any unique identifier, there exists exactly one related entity. Here, the studentId serves as the unique key, ensuring that each student is distinct and does not share their identifier with any other student. Consequently, one studentId maps to one student document and thus maintains a one-to-one correspondence between the studentId and the student's detailed information, such as name, address, and enrollment details. This structure ensures data integrity and cohort information clarity, supporting straightforward queries and data retrieval.