Referring Data from Previous Row in a Query

Hi Anonymous 

You might want to tweak the way you calculate the percentage change in the RETURN statement. You can convert the column to %

Calc column =
VAR previousDate_ =
    CALCULATE (
        MAX ( Table1[Date] ),
        ALL ( Table1 ),
        Table1[Date] < EARLIER ( Table1[Date] )
    )
VAR previousDateAvg_ =
    CALCULATE (
        MAX ( Table1[Average] ),
        ALL ( Table1 ),
        Table1[Date] = previousDate_
    )
VAR currentDateAvg_ = Table1[Average]
RETURN
    DIVIDE ( currentDateAvg - previousDateAvg_, previousDateAvg_ )

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Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

Hi Anonymous ,

You can also create a measure to get difference.

First, create an index column in the query editor to get the value of the previous "average".

Then create a measure like this:

Measure =
VAR current_index =
    MAX ( 'Table (3)'[Index] )
VAR last_average =
    CALCULATE (
        FIRSTNONBLANK ( 'Table (3)'[Average], 1 ),
        FILTER ( ALL ( 'Table (3)' ), 'Table (3)'[Index] = current_index - 1 )
    )
RETURN
    DIVIDE ( last_average, MAX ( 'Table (3)'[Average] ) )

Best Regards,
Liang
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