cancel
Showing results for
Did you mean:
Helper I

## Calculate difference value between cells in same column

Hello everyone,

I am quite new to DAX and need to obtain a calculated column (named difference) based on the following data:

Date               Value             Difference

25/6/2011     21.7                  0

26/6/2011     21.7                   0

27/6/2011     22.7                  1

28/6/2011     23.7                  1

29/6/2011     24.7                  1

30/6/2011     25.7                  1

1/11/2011       1                    1

2/11/2011       2                    1

3/11/2011       2.7                0.7

The first day of a month should be always 1 in the column difference. Is there a way to obtain this as a calculated column with dax (or either power query?) Thanks in advance!

1 ACCEPTED SOLUTION
Community Champion

Try this code for a new calculated column:

``````Difference =
VAR _date = CALCULATE(MAX('Table'[Date]), FILTER('Table', 'Table'[Date] < EARLIER('Table'[Date])))
VAR _lastValue =  CALCULATE(MAX('Table'[Value]), FILTER('Table', 'Table'[Date] = _date))
RETURN
IF(
_lastValue = BLANK(), 0,
IF(DAY('Table'[Date]) = 1, 1, 'Table'[Value] - _lastValue)
)``````

Proud to be a Super User!

Community Champion

Try this code for a new calculated column:

``````Difference =
VAR _date = CALCULATE(MAX('Table'[Date]), FILTER('Table', 'Table'[Date] < EARLIER('Table'[Date])))
VAR _lastValue =  CALCULATE(MAX('Table'[Value]), FILTER('Table', 'Table'[Date] = _date))
RETURN
IF(
_lastValue = BLANK(), 0,
IF(DAY('Table'[Date]) = 1, 1, 'Table'[Value] - _lastValue)
)``````

Proud to be a Super User!

Announcements

#### 2023 Release Wave 1 Plans

Power BI release plans for 2023 release wave 1 describes all new features releasing from April 2023 through September 2023.

#### Global Power BI Training

Make sure you register today for the Power BI Summit 2023. Don't miss all of the great sessions and speakers!

#### Business Application LATAM Summit 2023

Join the biggest FREE Business Applications Event in LATAM this February.

#### Global Power Platform Bootcamp

In this bootcamp we will deep-dive into Microsoft’s Power Platform stack with hands-on sessions and labs, delivered to you by experts and community leaders.

Top Solution Authors
Top Kudoed Authors