Ever found yourself wrestling with data and wishing for a magic wand to simplify things? Well, my recent dive into Power Query’s Custom Functions felt just like that.

Today, we’re diving into the world of custom functions, where you can take your data transformations to the next level. Inspired by a fantastic video tutorial, let’s explore how to create a custom function.

Creating the Custom Function

In this example we have to calculate Total Revenue for the Table below.

Right click the table and select Create Function

Modify your function script into the script editor.

= () => let
Source = Excel.Workbook(File.Contents(“file_address”), null, true),
Sheet1_Sheet = Source{[Item=”Sheet1″,Kind=”Sheet”]}[Data],
#”Added Custom” = Table.AddColumn(Sheet1, “Total Revenue”, each [Quantity] * [Price])
#”Added Custom”

Save the script, and now your custom function is ready for action! Anytime you want to calculate total revenue based on quantity and price, simply apply your custom function:

Why This is a Game-Changer:

  • Reusability: Apply your custom function across different datasets.
  • Efficiency: No need to repeat complex steps; your function does the heavy lifting.
  • Consistency: Ensure uniform calculations and transformations.

Crafting custom functions from existing queries is like discovering your own set of data superpowers. In the realm of Power Query, custom functions empower users to navigate the intricacies of data transformation with finesse. So, consider custom functions as your bespoke solutions, allowing you to craft data transformations that align precisely with your unique requirements and workflows. Embrace the potential of custom functions in Power Query, and witness how they can elevate your data processing capabilities to new heights. 🚀

Seema Keswani
Author: Seema Keswani