DISTINCT Function in Power BI Explained | Advanced DAX Tutorial | Module 20
Many Power BI developers misunderstand how DISTINCT works in DAX, especially when building lookup tables and relational models.
In this Advanced DAX Tutorial, you will learn how the DISTINCT function extracts unique values from columns and tables, why it is critical for dimension table creation, and how it helps maintain clean relationships in Power BI data models.
We will break down the DISTINCT syntax, understand how it behaves when used with column references vs table expressions, and walk through practical examples using:
'Product Lookup'[product_group]
'Product Lookup'[product_category]
You will also learn how experienced BI developers use DISTINCT to build lookup tables from blended datasets, which is a key technique when designing scalable Power BI data models.
If you want to become a strong Power BI developer, understanding DISTINCT, data modeling, and DAX evaluation behavior is essential.
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00:00 Why DISTINCT is Important in Power BI
00:15 DISTINCT Function Overview
00:35 DISTINCT Syntax Explained
01:05 Column vs Table Behavior in DISTINCT
01:35 Creating a New Table Using DISTINCT
02:05 Example: Extract Unique Product Groups
02:40 Example: Extract Unique Product Categories
03:10 Pro Tip: Building Lookup Tables with DISTINCT
03:25 Key Takeaway for Data Modeling
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