Let's Talk Relationships and Joins

Short summary

Power BI relationships bridge separate tables using shared columns (primary and foreign keys) to combine data—for example, matching Customers and Sales tables to find top customers. A star schema organizes this with a central fact table (Sales) connected to dimension tables (Customers, Products, Dates). Join types control what appears: inner joins show matching rows only, left joins preserve all left-table rows, and full outer joins keep everything—choose based on whether you need to find missing data or only complete records.

• •Primary and foreign keys create bridges between related tables in Power BI
• •Star schemas organize fact tables (transactions) surrounded by dimension tables (lookup data)
• •Join types determine which rows appear—inner (matches only), left (all left table), or full (all data)

Generated with AI, which can make mistakes.