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Frequent Visitor
Posts: 10
Registered: ‎07-03-2018
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I don't understand the restrictions of the CALCULATE (DAX).

[ Edited ]

Hello, community members.

 

I have been studying DAX function. ( URL : https://msdn.microsoft.com/query-bi/dax/calculate-function-dax)

There was something over an hour I couldn't understand.

 

There's nothing wrong right now, but I'm really curious about what that means.

 

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The following restrictions apply to Boolean expressions that are used as arguments:

  • The expression cannot reference a measure.

  • The expression cannot use a nested CALCULATE function.

  • The expression cannot use any function that scans a table or returns a table, including aggregation functions.

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Could anyone please give me examples or explanations?


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Super User
Posts: 859
Registered: ‎06-23-2016

Re: I don't understand the restrictions of the CALCULATE (DAX).

this reference is much more extensive

https://dax.guide/calculate/

https://www.sqlbi.com/articles/context-transition-and-filters-in-calculate/

 

regarding the boolean expression specifically (this is where the limitations are valid) e.g. check if color is red

CORRECT
CALCULATE(SUM(Table[Value]),Table[Color] = "Red")
CALCULATE(SUM(Table[Value]),LOWER(Table[Color]) = "red")
NOT CORRECT
Flag1 = IF(Table[Color] = "Red", TRUE,FALSE)
CALCULATE(SUM(Table[Value]),[Flag])

nested CALCUALTE is quite self explanatory, function that scans a table - my guess would be e.g. SUMX, FILTER (though I'm not sure about them)

please remember that instead of a boolean expression you can also pass a list of values - e.g. result of FILTER, DATESYTD, etc.

 

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Highlighted
Super User
Posts: 859
Registered: ‎06-23-2016

Re: I don't understand the restrictions of the CALCULATE (DAX).

this reference is much more extensive

https://dax.guide/calculate/

https://www.sqlbi.com/articles/context-transition-and-filters-in-calculate/

 

regarding the boolean expression specifically (this is where the limitations are valid) e.g. check if color is red

CORRECT
CALCULATE(SUM(Table[Value]),Table[Color] = "Red")
CALCULATE(SUM(Table[Value]),LOWER(Table[Color]) = "red")
NOT CORRECT
Flag1 = IF(Table[Color] = "Red", TRUE,FALSE)
CALCULATE(SUM(Table[Value]),[Flag])

nested CALCUALTE is quite self explanatory, function that scans a table - my guess would be e.g. SUMX, FILTER (though I'm not sure about them)

please remember that instead of a boolean expression you can also pass a list of values - e.g. result of FILTER, DATESYTD, etc.