问题
Is it possible to calculate conditional based running total in power query? I need to add numbers(cumulative sum) based on the group. See the image attached. Currently I'm using a formula to calculate that in sheet and loading it to query editor. Is there any other logic to achieve that in power query (if possible, without indexing : because index took too much time to load).
来源：https://stackoverflow.com/questions/49442192/how-to-calculate-conditional-running-total-in-power-query-excel-2016