Enforcing one-to-one relationships

On the topic of few things being impossible in ServiceNow, let's discuss one-to-one relationships.

Strictly speaking, a one-to-one relationship doesn't truly exist in ServiceNow. In database parlance, this would require that the right-hand table records have a primary key which matches the primary key of a record in the left table. Thus, you could have a left-hand record without a right-hand one, but could never have a right-hand record without the left-hand one.

That's interesting, but ServiceNow's Sys IDs are unique, and they have to be, because of the way ServiceNow's databases are structured on the back-end. Technically, ServiceNow has a flat database structure, depending on how it's configured. In a sense, ...

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