Extract Items Just Used in one List Using List.TransformMany
In this Power Query challenge (Challenge 212), we’re working with four different lists of item codes. The goal? ✅ Extract all codes that appear in exactly one list only—not duplicated across multiple lists.
In this video, you'll learn two powerful solutions:
UI-Based Approach using Remove Duplicates and other built-in transformations
M Code Approach using List.TransformMany for an efficient, code-driven solution
Whether you're a beginner or advanced Power Query user, this challenge helps sharpen your skills with list logic and transformations.
🔍 Key Concepts Covered:
Identifying unique list entries
Handling multiple list comparisons
Writing efficient M code using List.TransformMany
Visual vs Code-based solutions in Power Query
🔗 Don't forget to try the challenge yourself before watching the solution!
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