ALLEXCEPT not working when filtering blanks - powerbi

Question

I have a simple problem. My DAX measure does not seem to be working correctly when I filter for non-existing values. Here are some details:
Table:
Column1: A,A,A,A,A,B,B,B,B
Column2: 1,2,3,4,5,1,2,3,5
Measure = calculate(countrows(table), allexcept(column1))
Card Visual returns correct row count when I filter by column1 (any value in filtering pane)
However it returns wrong row count when I filter by column2 = "4" and Column1 = "B" (in filtering pane). It seems that it should ingore filtering by column2 and it does except when I specifically filer for value = "4". It gives "blank" result value in a card visual then.
Any ideas why?
Here's the screen. I would like to populate that blank cell with "4" (in a singe-table data model.enter image description here

Answer 1

In your case you dont need to add allexcept in your measure. Below code would be fine.
TestMeasure = countrows(Test_Data)
PFB screenshot

Answer 2

I am hoping that you have a data model as following
table name _dim1
colA
A
B
C
table name _dim2
colB
1
2
3
4
5
table name _fact
colA
colB
A
1
A
2
A
3
A
4
A
5
B
1
B
2
B
3
B
5
C
2
C
3
If you have this you can reach where you need by using following measures
Measure3 =
CALCULATE ( COUNTROWS ( _fact ), ALL ( _dim2[colB] ), VALUES ( _fact[colA] ) )
Measure9 =
VAR _1 =
MAX ( _dim2[colB] )
VAR _2 =
CALCULATE (
MAXX (
FILTER ( _dim2, _dim2[colB] <= _1 ),
LASTNONBLANKVALUE ( _dim2[colB], [Measure3] )
),
ALL ( _dim2[colB] )
)
RETURN
_2
Measure10 =
VAR _1 =
MAX ( _dim2[colB] )
VAR _2 =
CALCULATE (
MAXX (
FILTER ( _dim2, _dim2[colB] > _1 ),
FIRSTNONBLANKVALUE ( _dim2[colB], [Measure3] )
),
ALL ( _dim2[colB] )
)
RETURN
IF ( ISBLANK ( [Measure9] ) = TRUE (), _2, [Measure9] )
I don't think you can reach here from a single table like following
colA
colB
A
1
A
2
A
3
A
4
A
5
B
1
B
2
B
3
B
5
C
2
C
3