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MarkCBB's avatar
MarkCBB
Helper V
9 years ago
Solved

Last Year This/Same Week

Hello there,   I created the follow DAX Measure to calculate This Year This Week, I am sure there is a better way to do this, but this does work: TYTW Units = CALCULATE([Total Units],FILTER('CALEN...
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  • Anonymous's avatar
    Anonymous
    9 years ago

    How is [Week Year ID] stored?  Could you build last years [Week Year ID] by making use of the same one you used in your TWTY measure?

    For Example if [Week Year ID] is YYYYWW you could build the string using a combination of LEFT and RIGHT to get the Year and Week components, then decrement the YYYY by one and build a new filter string from there.

v-caliao-msft's avatar
v-caliao-msft
Microsoft Employee
9 years ago

MarkCBB,

 

Since there are no PREVIOUSWEEK function in DAX.

 

So if need to get last year same week, you need to calculate the Year and week and weektotal in your data model, and then use LOOKUPVALUE function to get previous week value and last year same week value.

I have two tables in my sample data model. In your date table, create two columns.
Year = YEAR('Date'[CalendarDate])
WeekNumber = WEEKNUM('Date'[CalendarDate])

then create a new table
Table = SUMMARIZE('Date','Date'[Year],'Date'[WeekNumber],"Weektotal",calculate(SUM(Sales[SalesAmount]),ALLEXCEPT('Date','Date'[Year],'Date'[WeekNumber])))
Create three measures.
WeekTotalSaleAmount = calculate(SUM(Sales[SalesAmount]),ALLEXCEPT('Date','Date'[Year],'Date'[WeekNumber]))
PreviousWeek = LOOKUPVALUE('Table'[Weektotal],'Table'[Year],IF(MAX('Date'[WeekNumber])=1,MAX('Date'[Year])-1,MAX('Date'[Year])),'Table'[WeekNumber],IF(MAX('date'[WeekNumber])=1,53,MAX('Date'[WeekNumber])-1))

PreviousYearWeek = LOOKUPVALUE('Table'[Weektotal],'Table'[Year],MAX('date'[Year])-1,'Table'[WeekNumber],MAX('date'[WeekNumber]))

 

Capture.PNG Capture1.PNG

 

Regards,

Charlie Liao

Anonymous's avatar
Anonymous
Not applicable
7 years ago

This solution works great, but I have a newbie question. How would you adapt it to add in a category. For example I would like the PreviousYearWeek to return the number of Bikes sold the same week last year and the number of balls. Right now it seems to total my groups by week.