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Power Query Tutorial: How to Use Left Anti Join (Step-by-Step)

Master Left Anti Join in Power Query | Data Cleaning Made Easy

Power BI & Power Query: Left Anti Join Explained

Left Anti Join in Power Query | Remove Matching Records Fast

Data Transformation with Power Query: Left Anti Join Guide

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Learn how to use Left Anti Join in Power Query to filter and remove matching records from datasets. Perfect for data cleaning in Excel or Power BI!

✅ Outline for Blog/Video
1. Introduction
What is a Join in Power Query?

Why Left Anti Join is useful.

2. What is Left Anti Join?
Definition: Keeps rows from the first table that don't match in the second table.

Example use cases:

Finding customers without orders

Identifying missing values in datasets

3. How to Perform Left Anti Join in Power Query
Step 1: Load both tables into Power Query

Step 2: Use "Merge Queries" option

Step 3: Select Left Anti Join from Join Kind

Step 4: Review results (rows from Table A not found in Table B)

4. Real-Life Example
Table A: List of registered users

Table B: List of users who made purchases

Goal: Find registered users who didn't purchase.

5. Tips & Best Practices
Check data types before joining

Remove duplicates if necessary

Use filters after merging for better control

6. Common Mistakes
Mismatched column names

Data type differences causing failed joins

7. Wrap-Up
Why Left Anti Join is great for data cleanup and validation.

✅ Quick Code/Visual Explanation
If needed, I can generate screenshots or Power Query UI mockups for better visualization.