Add a null condition in DAX

[Narender]

Hi all,

I have to add a null condition in DAX.

My condition is like:

Measure =

CALCULATE(sum(TAX_TRANSACTION[TAX_SUB_TRANS.AMOUNT]),

FILTER(TAX_TRANSACTION,TAX_TRANSACTION[TAX_SUB_TRANS.REVERSE_FLAG]="N" && (TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=2 ||TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=13 ||TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=15))) 

I need to add TAX_SUB_TRANS.REVERSE_FLAG]=null or "N"

In above expression I write only TAX_SUB_TRANS.REVERSE_FLAG] "N"  because Null is not working.

Plaese tell mw how  can I add Reverse_flag = null?

Thanks,

Narender

[Stachu · Accepted solution]

Null is BLANK() in DAX
https://msdn.microsoft.com/en-us/query-bi/dax/blank-function-dax
try this syntax

TAX_TRANSACTION[TAX_SUB_TRANS.REVERSE_FLAG] = BLANK()

[zlokesh]

Hi @Narender,

      There is  ISBLANK function in Power BI, use that, If any issue let me know.

msdn Example:- //Sales to Previous Year Ratio

=IF( ISBLANK('CalculatedMeasures'[PreviousYearTotalSales]) , BLANK() , ( 'CalculatedMeasures'[Total Sales]-'CalculatedMeasures'[PreviousYearTotalSales] ) /'CalculatedMeasures'[PreviousYearTotalSales])

Thanks

[Narender]

Hello Lokesh,

I  have to add simple condition not the if condition like

Sum of sale where regime_code = N or Null

Is there any way to add this condition in DAX.

I am facing problem in Null .If condition will not resovle my issue.

Thanks,

Narender

[zlokesh]

Dear @Narender,

  ISBLANK  is the function for NULL.   use ISBLANK  to check NULL.

Your expression will be like below, Please check in editor for accuracy. 

Measure =

CALCULATE(ISBLANK(sum(TAX_TRANSACTION[TAX_SUB_TRANS.AMOUNT]),

FILTER(TAX_TRANSACTION,TAX_TRANSACTION[TAX_SUB_TRANS.REVERSE_FLAG]="N" )&& (TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=2 ||TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=13 ||TAX_TRANSACTION[TAX_SUB_TRANS.CHARGE_TYPE_NO]=15))) 

Thanks

[Stachu · Accepted solution]

Hi @zlokesh
I think you're incorrect - ISBLANK is checking whther a given expression is BLANK or not, returning TRUE/FALSE

https://msdn.microsoft.com/en-us/query-bi/dax/isblank-function-dax

BLANK() will return a blank/null value
https://msdn.microsoft.com/en-us/query-bi/dax/blank-function-dax

[Anonymous]

It's not quite correct though because if they use the blank in a calculation it will count as 0 not NULL. Which will introduce errors. 

As in this article https://www.sqlbi.com/articles/how-to-handle-blank-in-dax-measures/ 

[Narender]

Hi Stachu,

Blank() is working in Dax.

Like

Reverse_Flag= N || Reverse_Flag=Blank().

[Stachu · Accepted solution]

Null is BLANK() in DAX
https://msdn.microsoft.com/en-us/query-bi/dax/blank-function-dax
try this syntax

TAX_TRANSACTION[TAX_SUB_TRANS.REVERSE_FLAG] = BLANK()