Power BI Basics: How Relationships, Schemas, and Joins Work Together

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A beginner Power BI user shares lessons learned after struggling to connect multiple tables in their first multi-table assignment. Unlike Excel's single-sheet approach, Power BI encourages splitting data into separate tables linked by common ID columns, reducing repetition and mirroring real database design. Relationships are created in Model view by connecting shared columns, with one-to-many being the most common type. The star schema — one central fact table surrounded by dimension tables — proved simpler to manage than the more complex snowflake schema for beginner projects. In Power Query, joins like Left Outer and Inner merges allow tables to be combined before loading into the model, with Left Outer recommended as a safer default to avoid unintended data loss.

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