Building a robust Power BI solution starts long before the first visual is placed on a report canvas. The foundation of every performant, scalable, and maintainable Power BI report is its data model. This article explains the core concepts of data modelling in Power BI—schemas, fact and dimension tables, relationships, filter direction, and joins—and shows how to apply them when designing a real-world solution. 1. Data Modelling in Power BI Data modelling in Power BI is the pr...