Creating a new colunm with max values of another column for each month
Hello community, I would like to create an extra colunm as in the example below. The result is the max of the volume of data per month. I have tried to do it with "group by" of the :month column and then use the "max()" function from the formula option but no sucess. Anyone has an idea to create this extra colunm without going to summary and merge. thanks!!