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

[ted_kim]

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?

[Stachu · Accepted solution]

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.