Ah, appending tables in Power BI – it's like stitching fabric together to create a beautiful tapestry.

Let's walk through how to do this step by step.

This guide assumes you already have the tables loaded into Power BI:

Appending Three Tables in Power BI: 

1. Launch Power Query Editor:

• Open your Power BI Desktop.
• Click on "Home" in the ribbon, then select "Edit Queries". This will launch the Power Query Editor.

2. Select the First Table:

• In the Power Query Editor, you'll see a list of all tables and queries on the left panel. Click on the first table you want to append.

3. Append the Tables:

• With the first table selected, navigate to the "Home" tab in the ribbon.
• Click on the "Append Queries" dropdown. If you're appending tables for the first time, simply select "Append Queries". If you're modifying existing ones, choose "Append Queries as New".
• A window will pop up, allowing you to add tables to append. From the dropdown, select the second table you want to append. Click on the "Add Table" button to append a third table.
• Now, select your third table from the new dropdown that appears.

4. Check the Appended Result:

• After appending, your first table will now have the combined data of all three tables. Check the data preview at the bottom to make sure it looks correct.

5. Address Potential Issues:

• Ensure all three tables have the same column names and data types. If there's a mismatch, the append might not work correctly or produce unexpected results.
• If columns don't align, consider using the "Transform" tab in Power Query to rename, reorder, or change the data type of columns to make them consistent across tables.

6. Load or Apply Changes:

• Once you're satisfied with the appended table, click the "Close & Apply" button in the upper-left corner. This will close the Power Query Editor and apply the changes to your Power BI model.

Final Thoughts: Appending tables is a powerful way to combine datasets in Power BI, but always ensure the tables you're appending are compatible in terms of structure.

Think of it as joining puzzle pieces; they need to fit together perfectly to create a clear picture.

Happy data stitching! 🧵📊🔗