You are developing a Microsoft Power BI semantic model. Two tables in the data model are not connected in a physical relationship. You need to establish a virtual relationship between the tables. Whic

USERELATIONSHIP() is used to activate an *existing* but inactive relationship between tables, not to create a virtual relationship where none exists.

The TREATAS() DAX function applies the columns of a table as filters to the columns of an unrelated table. This allows calculations to be performed across tables that do not have a direct physical relationship or when the existing relationship is not suitable for the current context, effectively creating a virtual relationship for filtering purposes.

PATH() is used to work with parent-child hierarchies within a single table, not to establish relationships between different tables.

CROSSFILTER() is used to modify the cross-filter direction of an *existing* relationship, not to establish a virtual relationship between unconnected tables.