Calculated Colum: Get MIN value from a filtered table

[derekmalag]

Hi, I'm stuck in something that I think it is simple but I can't make it work so I'm pretty sure I'm doing something incorrectly but don;t know what so would appreciatte any light on it.

I have a Table with two columns and I want to create a calculated column that get the Min value of the Model. The expected output is 

Model	Total_Value	MIN_VALUE
A	3 *	3
A	4	3
B	5	2
B	2*	2
C	9	7
A	6	3
C	7*	7
B	8	2

So I've tried the following DAX query for the calculated column

MIN_VALUE = CALCULATE (
     MIN('MyTable'[Total_Value]),
     FILTER('MyTable',[Model]=[Model])
)

 However, what I get is the minimum value of the table without being filtered (2 for all values).

I would appreciate any help on what I am doing wrong.

Many thanks in advance

[Anonymous]

Here is the simple one line solution:

Min_Value = CALCULATE(MIN('Table'[Total Value]),FILTER('Table',EARLIER('Table'[Model])='Table'[Model]))

[HotChilli]

@Greg_Deckler did I just catch you using a "CALCULATE"? 

can't we rely on anything any more?....

[Greg_Deckler]

@HotChilli Ha! Good one. I was actually going to include a version using MINX but figured it was overkill. Was easier just to correct the version of the formula that used CALCULATE since it was already there.

[Greg_Deckler · Accepted solution]

@derekmalag Here are a couple different ways:

MIN_VALUE = 
CALCULATE (
     MIN('MyTable'[Total_Value]),
     FILTER('MyTable',[Model]=EARLIER('MyTable'[Model]))
)

MIN_VALUE = 
  VAR __Model = [Model]
RETURN
  CALCULATE (
     MIN('MyTable'[Total_Value]),
     FILTER('MyTable',[Model]=__Model)
  )

[derekmalag]

amazing @Greg_Deckler , I've used the [EARLIER] option and it works so not going through the second :). Assuming not, but just to be sure, if there is any consideration in performance between these two options?

Many thanks again 

[AlexisOlson]

@derekmalag If you're concerned about performance, then you should filter on columns rather than tables whenever possible.

I'd probably write it like this instead:

MIN_VALUE =
CALCULATE (
    MIN ( 'MyTable'[Total_Value] ),
    ALLEXCEPT ( 'MyTable', 'MyTable'[Model] )
)

[Greg_Deckler]

@derekmalag In my testing, no I have not seen a performance difference between the two approaches. You might be interested in this: In Defense of EARLIER - Microsoft Power BI Community