Creating custom function

[kaka]

Hi, 

I have this custom function in tableau: 

{FIXED [Student Num] : MIN([Due Date]) }

I am trynig to rewrite it in power bi but I am striggling with the syntax of how to represent FIXED in powerbi ? 

[LaurentCouartou]

Add a calculated column to your table. The expression to return the first due date for a student would look like this:

=CALCULATE(  MIN(YourTable[Due Date]) 
     , ALLEXCEPT(YourTable, YourTable[Student Num] )
)