Rolling DateDiff to compare dates within a Table

[Anonymous]

Hi,

I need to calculate date diff within a table to the prior row,

Here's a sample dataset:

CustomerID;OrderID;OrderDate;DaysBetweenOrders

123;12;'2009-04-01';0

123;12;'2009-04-23';22

123;12;'2009-05-14';21

123;43;'2009-05-13';0

123;43;'2009-05-29';16

432;54;'2009-06-01';0

432;54;'2009-06-04';3

432;54;'2009-06-04';0

555;65;'2009-06-22';0

555;67;'2009-06-30';0

653;89;'2009-07-04';0

Please help me here to how can we achieve this in Power BI.

Thanks,

Ganesh

[Stachu · Accepted solution]

this code below almost works - the issue is it gives 3 for both rows dated 2009-06-04
in order to solve this you would need to either
1) add row id as a column and use that as criteria instead of date
2) have time of the order as well as the date, so you could specify that orders did not happen in the same moment

Column =
VAR CurrentCustomerID = 'Table'[CustomerID]
VAR CurrentOrderID = 'Table'[OrderID]
VAR CurrentDate = 'Table'[OrderDate]
VAR PreviousDate =
    CALCULATE (
        LASTDATE ( 'Table'[OrderDate] ),
        FILTER (
            ALL ( 'Table' ),
            'Table'[CustomerID] = CurrentCustomerID
                && 'Table'[OrderID] = CurrentOrderID
                && 'Table'[OrderDate] < CurrentDate
        )
    )
RETURN
    IF ( PreviousDate = 0, 0, CurrentDate - PreviousDate )