Microsoft Dataverse supports all of the following relationships except which one?

Microsoft Dataverse indeed supports various types of relationships to facilitate data modeling and management within applications. The three primary relationships that Dataverse supports are many-to-many, one-to-many, and many-to-one.

Many-to-many relationships allow records from one table to be related to multiple records in another table, and vice versa. One-to-many relationships establish a clear parent-child connection where a record in the first table can correspond to multiple records in the second table, but each record in the second table relates back only to a single record in the first. Many-to-one relationships are essentially the reverse of one-to-many; multiple records in one table can relate to a single record in another table.

However, a one-to-one relationship—where a single record from one table directly correlates with a single record in another table—is not directly supported in Microsoft Dataverse. Instead, this scenario is typically addressed through clever modeling, such as implementing unique constraints and managing related tables that may contain similar data structures. The absence of direct support for one-to-one relationships means that users must creatively utilize existing relationship types to achieve similar outcomes.