Power BI Relationships Explained: How Table Links Shape Accurate Reports

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Power BI does not automatically link tables from different data sources, so users must manually define relationships to enable correct filtering and aggregation. A relationship connects matching fields across tables, allowing filter context to flow between visuals and slicers. The star schema, where a central fact table such as Sales is surrounded by dimension tables like Customers and Products, is the recommended structure for clarity and performance. A one-to-many relationship, the most common type, links a single record in one table to multiple matching records in another. Choosing a simpler star schema over a more complex snowflake structure generally results in faster query performance and easier report maintenance.

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