Understanding Data Modeling in Power BI: Joins, Relationships, and Schemas Explained

What Is Data Modeling? Data modeling refers to how one organises and connects their data so it can be analysed correctly. In Power BI, it defines how tables relate to each other, how filters move across visuals, and how your measures calculate results. Joins Joins combine data from two tables based on a shared column. In Power BI, joins happen in Power Query Editor before data enters the model. INNER JOIN - Returns only rows with a match in both tables. LEFT JOIN - Returns all rows from the left table only. RIGHT JOIN - Returns all rows from the right table only. FULL OUTER JOIN - Returns everything from both tables. Useful for spotting data gaps. LEFT ANTI JOIN - Returns only rows from the left table with no match on the right. RIGHT ANTI JOIN - Returns only rows from the right table with no match on the left. Power BI Relationships Relationships connect tables inside the model without merging them. They control how filters move between tables when you interact with visuals. Cardinali