If you want to use the Excel LEFT Function in Power Query, then you can’t directly go for it. This is because the Excel LEFT Function is not supported in M.
Use Excel’s Right Function With ‘M’ To Extract Left Side Data
But there is an alternate way for using the LEFT Function in M which is explained below.
Step 1: Select the Column for Extracting Left Side Data
Load the data in Power Query and select the ‘Month of Joining’ column for applying custom Column formula as shown in below picture.
Step 2: Add Custom Column to Extract Left Side Data
To add the Custom Column go to-
Add Column > Custom Column
Step 3: Extract Left Side Data using M Language
To extract the left side data we have to create a simple M expression.
In the New column name text box, we have to write the new column name as shown in the below picture.
Now, you can write the M query as given below:
- In the Custom column formula, type the function- Text.Start(
- From the Available columns select the Month of Joining column and press Insert.
- Then complete the formula by entering ‘, 3)’
The final formula looks like this:
Text.Start([Month of Joining], 3)
- Start function is to get the first X characters of the Month of Joining column
- Number 3 is used to specify the first 3 characters (left side characters) to be extracted as shown below.
Step 4: Close & Apply
Close and apply the changes after extracting left side data as shown in the below picture.