A common reason you create a one-to-one relationship is security.

Name: A common reason you create a one-to-one relationship is security.
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One-to-one relationships can be used in situations where a high level of security is needed. For example, in a healthcare setting, a patient's medical record may only be accessible to one doctor, and therefore a one-to-one relationship between the patient and the doctor would be necessary to ensure proper access control.

A Common Reason You Create a One-To-One Relationship Is Security