{"id":1909,"date":"2026-09-04T12:24:24","date_gmt":"2026-09-04T12:24:24","guid":{"rendered":"https:\/\/entri.app\/explore\/?post_type=curriculum&#038;p=1909"},"modified":"2026-09-08T09:21:42","modified_gmt":"2026-09-08T09:21:42","slug":"many-to-many-relationship-in-power-bi","status":"publish","type":"curriculum","link":"https:\/\/entri.app\/explore\/power-bi\/many-to-many-relationship-in-power-bi\/","title":{"rendered":"Many-to-Many Relationship in Power BI"},"content":{"rendered":"<h2>What Is a Many-to-Many Relationship in Power BI?<\/h2>\n<p>A many-to-many relationship in Power BI occurs when both tables have duplicate values in their key columns \u2014 neither side has a unique key. This is useful for scenarios like mapping students to courses or products to categories where a single row on one side can match multiple rows on the other, and vice versa.<\/p>\n<h2>When Do You Need a Many-to-Many Relationship?<\/h2>\n<p><strong>Many-to-many relationships are needed when data doesn&#8217;t fit the standard one-to-many pattern:<\/strong><\/p>\n<ul>\n<li><b><\/b><strong><b>Budget vs. Actuals: <\/b><\/strong>A budget table joined to an actuals table where both sides have repeating department + date combinations.<\/li>\n<li><b><\/b><strong><b>Multiple assignments: <\/b><\/strong>Employees to projects, students to courses, products to categories.<\/li>\n<li><b><\/b><strong><b>Aggregated tables: <\/b><\/strong>Joining a summarized table to a detailed transaction table with mismatched granularity.<\/li>\n<\/ul>\n<h2>How to Handle Many-to-Many Relationships in Power BI<\/h2>\n<p><strong><b>Two approaches:<\/b><\/strong><\/p>\n<ul>\n<li><b><\/b><strong><b>Direct Many-to-Many: <\/b><\/strong>Since September 2018, Power BI supports direct many-to-many cardinality. Set cross-filter to Both. Works but can produce unexpected results.<\/li>\n<li><b><\/b><strong><b>Bridge table (recommended): <\/b><\/strong>Create an intermediate table with unique key combinations. Each original table connects to it via one-to-many. More controlled filter flow.<\/li>\n<\/ul>\n<h2>How to Avoid Many-to-Many Relationships<\/h2>\n<ul>\n<li><b><\/b><strong><b>Check for duplicate keys: <\/b><\/strong>Clean the dimension table in Power Query to restore unique keys.<\/li>\n<li><b><\/b><strong><b>Change granularity: <\/b><\/strong>Aggregate one table to match the other&#8217;s grain.<\/li>\n<li><b><\/b><strong><b>Use a bridge table: <\/b><\/strong>Convert many-to-many into two one-to-many relationships.<\/li>\n<\/ul>\n<h2>Many-to-One Relationship in Power BI<\/h2>\n<p>Many-to-one is a one-to-many relationship viewed from the opposite direction. From Products: one-to-many. From Sales: many-to-one. Power BI treats them identically.<\/p>\n<h2>How to Handle a Many-to-Many Relationship in Power BI<\/h2>\n<p>This tutorial shows two approaches to many-to-many relationships \u2014 direct cardinality and a bridge table \u2014 so you can pick the right one. About 6 steps<em><i>.<\/i><\/em><\/p>\n<h2>Prerequisites<\/h2>\n<ul>\n<li>Power BI Desktop installed<\/li>\n<li>Two tables with a many-to-many relationship (e.g., Budget and Actuals sharing Department and Month)<\/li>\n<\/ul>\n<h2>Approach A: Direct Many-to-Many Cardinality<\/h2>\n<p>Step 1 \u2014 Load both tables and switch to Model View.<\/p>\n<p>Step 2 \u2014 Create the relationship. Drag the shared column; set Cardinality to Many-to-Many.<\/p>\n<p>Step 3 \u2014 Set cross-filter to Both. Test a visual to verify totals.<\/p>\n<h2>Approach B: Bridge Table (Recommended)<\/h2>\n<p>Step 4 \u2014 Create the bridge table in Power Query. Reference one table, select key columns, remove duplicates.<\/p>\n<p>Step 5 \u2014 Connect both tables to the bridge via one-to-many.<\/p>\n<p>Step 6 \u2014 Test and verify totals.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Is a Many-to-Many Relationship in Power BI? A many-to-many relationship in Power BI occurs when both tables have duplicate values in their key columns \u2014 neither side has a unique key. This is useful for scenarios like mapping students to courses or products to categories where a single row on one side can match [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"template":"","meta":{"_acf_changed":false},"curriculum-category":[109,91],"custom_linking_tags":[],"class_list":["post-1909","curriculum","type-curriculum","status-publish","hentry","curriculum-category-data-modeling-in-power-bi","curriculum-category-power-bi-tutorials"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Many-to-Many Relationship in Power BI - Entri Free Materials<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/entri.app\/explore\/power-bi\/many-to-many-relationship-in-power-bi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Many-to-Many Relationship in Power BI - Entri Free Materials\" \/>\n<meta property=\"og:description\" content=\"What Is a Many-to-Many Relationship in Power BI? 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