Help Understanding DAX Formula: RANKX With EARLIER

[dgreen1]

I took over a partially completed project from someone that is no longer with the company. Could you help explain what this formula is doing/how it works?

= RANKX(FILTER(Table,Append1[IDNumber]=EARLIER(Table[IDNumber])),Table[MonthStart],,DESC,Dense)

[ValtteriN · Accepted solution]

Hi,

RANKX ranks the values given in the filter context. In your case the values of [MonthStart] column are ranked in desceding order. Additional condition is that the IDNumber must match the id of the current row. Dense makes it so that there aren't any gaps in ranking order.


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[dgreen1]

So in this case the most recent month for an ID without a match gets a 1, the preceding month where that ID existed gets a 2, and so on?