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

Power BI is a platform that enables users to connect to various data sources, transform data, create interactive visualizations, and share insights through dashboards and reports. Data modeling refers to the process of defining how tables connect, interact, and filter each other to enable accurate calculations, fast performance, and intuitive reporting. SQL JOINS INNER JOIN -Returns matching rows from both tables. LEFT JOIN -All rows from left table, matching from right, NULLs for no match. RIGHT JOIN -All rows from right table, matching from left, NULLs for no match. FULL OUTER -All rows from both, NULLs where no match. LEFT ANTI -Rows in left table with no match in right. RIGHT ANTI -Rows in right table with no match in left. POWERBI RELATIONSHIP Power BI relationships connect tables in the data model to enable dynamic filtering and accurate aggregations across visuals without physically merging data. Relationship Cardinality Cardinality defines how many rows in one table match rows