When creating custom columns in Power Query, it’s important to ensure that the data is correctly formatted and ready for analysis. One way to streamline this process is by assigning data types ...

In Power Query, click Add Column. In the General column, click Custom Column. In the resulting dialog, enter a meaningful name.

Identify columns with meaningful data: Add a custom column to the summary table to compare the `Count` and `Null Count` values. This step helps pinpoint columns that contain actual data.

I’m using Microsoft 365, but Power Query is available through 2010, as an add-in. Excel Online doesn’t fully support Power Query, ... select all of the columns in Power Query.