In Power BI data modeling architecture, a relationship serves as a formal contract that defines how distinct tables interact without physically merging their underlying rows prior to visualization generation. The mechanism relies on the simultaneous definition of unique keys, cardinality constraints (One-to-One through Many-to-Many), and directed or bidirectional filter propagation rules within the Model Layer to ensure accurate aggregation in the Visual Layer. This theoretical framework establishes that silent calculation errors often originate from incorrect definitions of these relational properties rather than visible runtime failures, necessitating rigorous adherence to schema design principles like Star Schema over naive merging strategies.
In Power BI data modeling architecture, a relationship serves as a formal contract that defines how distinct tables interact without physically merging their underlying rows prior to visualization ge…