Calculate sales for the previous month

[mikro87]

Hi, 

I have one field with only the month (1,2,3,...) and I want to get the sum of the previous month.

So I got:

Sales = Sum(SQL[Sales])

Sales1 = Calculate([Sales]; SQL[month]=SQL[month]-1)

This isn't working. Can anyone h

[amitchandak]

Try

Sales1 =

var _max maxx(SQL,SQL[month])

return

Calculate([Sales]; all(SQL[month]),SQL[month]=_max-1)

But what will you do for year changes ?

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[zoloturu]

Hi @mikro87 ,

Try next code:

Sales1 =
VAR __CurrMonth = MAX ( SQL[month] )
VAR __PrevMonth = __CurrMonth - 1

RETURN
    CALCULATE ( [Sales]; SQL[month] = __PrevMonth )

Regards,
Ruslan Zolotukhin (zoloturu)
BI Engineer at Akvelon Inc. / Kharkiv Power BI User Group Leader / DAX & Power BI Trainer
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[mikro87]

It works so far.
But now I have year(2018, 2019, ...) too.
How can I compare the previous month also from Dec. to Jan.?

[zoloturu · Accepted solution]

@mikro87 ,

You mentioned only month so I wrote in that way. Try next one:

Sales1 =
VAR __CurrMonth = MAX ( SQL[month] )
VAR __CurrYear = MAX ( SQL[year] )
VAR __PrevMonth = IF ( __CurrMonth > 1, __CurrMonth - 1, 12 )
VAR __YearOfPrevMonth = IF ( __CurrMonth > 1, __CurrYear, __CurrYear - 1 )

RETURN
    CALCULATE ( [Sales], SQL[month] = __PrevMonth, SQL[year] = __YearOfPrevMonth )

Regards,
Ruslan Zolotukhin (zoloturu)
BI Engineer at Akvelon Inc. / Kharkiv Power BI User Group Leader / DAX & Power BI Trainer
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It was useful? Press Thumbs Up!

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[mikro87]

I get a syntax error, row 4 & 5

[zoloturu]

@mikro87 ,

Do you use comma or semicolon at your formulas? Maybe you need to replace to proper? 

Provide a screenshot of an error and a code if that not helps.

Regards,
Ruslan Zolotukhin (zoloturu)
BI Engineer at Akvelon Inc. / Kharkiv Power BI User Group Leader / DAX & Power BI Trainer
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It was useful? Press Thumbs Up!

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[mikro87]

I needed the semicolon, thanks