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GJUDGE's avatar
GJUDGE
Helper II
4 years ago
Solved

Comparing Periods in the same table

I am sure this is a fairly straightforward problem for most but I'm fairly new to Power BI and any help is appreciated!   I have a single table that compiles monthly reporting information. I want t...
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  • v-xiaotang's avatar
    v-xiaotang
    4 years ago

    Hi GJUDGE 

    You can use Edate() function to get last period, for example, 

    Last Period = 
    var _currentDate=MAX('table'[date])
    var _lastDate=EDATE(_currentDate,-1)
return 
    CALCULATE(SUM('table'[Output]),'table'[date]=_lastDate)

    Kindly note:  Edate() function has some limitations,

    If you can't use Edate() on some occasions, you can try this measure,

    Last Period = 
    var _maxDate=MAX('table'[date])
    var _lastDate=DATE(YEAR(_maxDate),MONTH(_maxDate)-1,1)
return 
    CALCULATE(SUM('table'[Output]),'table'[date]=_lastDate)

     

     

    Best Regards,

    Community Support Team _Tang

    If this post helps, please consider Accept it as the solution to help the other members find it more quickly.

GJUDGE's avatar
GJUDGE
Helper II
4 years ago

jppv20  The measure is giving me the total of the output column as opposed to the output difference column. I have copied my measure below with actual table names etc., if you can see any errors within this?

 

Monthly MW Change =

var Output = CALCULATE(SUM('Master Data'[Projected Capacity (MW)]),FILTER('Master Data','Master Data'[Reporting Period]=MAXX('Master Data','Master Data'[Reporting Period])))
var OutputLastPeriod = CALCULATE(SUM('Master Data'[Projected Capacity (MW)]),FILTER('Master Data',MONTH('Master Data'[Reporting Period])=MONTH(MAXX('Master Data','Master Data'[Reporting Period]))-1))

Return

Output-OutputLastPeriod
GJUDGE's avatar
GJUDGE
Helper II
4 years ago

jppv20 Sorry, it actually works! I still had a filter on!! Thank you for your help! Could you help me understand how would I modify this measure to then compare the start of the year (with a fixed date rather than reporting period included?)

to current month?