Sum between specific values

[errepinna]

Hello guys, I started to experiment with Power Bi yesterday. Got a lot to learn. Here's my problem:

How do I add a column ∆ in a table from the Query Editor? The screen is from an Excel example I made.

[amitchandak]

@errepinna , Try a new column like

new column =
var _last = maxx(filter(Table, [DATE] < earlier([DATE])),[DATE])
return
[TotalMoney]- maxx(filter(Table, [DATE] =_last ),[TotalMoney])

[errepinna]

This works! Only one thing: the first raw displays the original value of [TotalMoney]. Is there a way to make it go to zero? I was thinking about putting a condition on the value of _last but I couldn't make it work.

[amitchandak · Accepted solution]

@errepinna , something like this

new column =
var _last = maxx(filter(Table, [DATE] < earlier([DATE])),[DATE])
return
if(isblank(_last), blank(), [TotalMoney]- maxx(filter(Table, [DATE] =_last ),[TotalMoney]))