Solved: In list_page view how to show the arithmetic result of two columns in the third

Hi, how to show the arithmetic result of two columns in the third on a list view.

I have two columns showing values - I would like to use third column to show result of basic arithmetic equitation between those two previous column. How its done?
Kind regards,
Piotr

@piotr you will have to create a custom field and write a query to add the two fields. Similar to this video PHPRad Tips and Tricks: Using Custom Field Expression - YouTube

Thank You WillVin!! I found simplier solution. On “Pages” tab, I select mentioned table and on 3-rd row Ive add “add custom field”. There Ive put: tablename.row1/tablename.row2. Now on listViev I have additional column with required value.