Distinct count based on all selected values

[Ant_BM]

Hi all,

I have a Count problem that I can't seem to find an answer to. 

I have two tables Events and Event_Categories:

Event

ID

111

112

113

114

Event_categories
Event_ID	Category
111	A
111	B
112	A
113	B
114	C

I also have a slicer with the category values.

I want to create a measure with the distinct count of Event_ID where the Event_ID is present for all selected Category values.

For example: if I select from my slicer the values A and B the distinct count should return 1 (as only Event_ID 111 matches on the selected values - if I selected only category value B it should return a distinct count of 2). 

I need the measure to also work on a table visual with the Event[ID] value, such as below for Category values A and B:

Event
ID	Distinct_count
111	1
112	0
113	0
114	0

Any suggestions on how I can create a measure with the expected output would be greatly appreciated. 

[vk_pbi]

Hi

Please try this below DAX

cnt = 
VAR _Combine =
CONCATENATEX(
    Event_categories,
    Event_categories[Event ID],","
)

VAR _CountRows= 
COUNTX(
    VALUES(Events[ID]),
    _Combine
)
RETURN
_CountRows

[Ant_BM]

Hi vk_pbi,

Thank you for the reply.

I tried the DAX and it returns a distinct count where the category is A OR B whereas I'm hoping to return a count where Event_ID is present for all of the selected slicer values (i.e. A and B):

In the above example the desired result would be 1

[vk_pbi]

I think, i made it a bit complicated, but lets check it out 

cnt = 
VAR _NoofselectedValues = 
COUNTROWS(ALLSELECTED(Event_categories[Category]))

VAR _Combine =
CONCATENATEX(
    Event_categories,
    Event_categories[Event_ID],","
)
VAR _Combine_cat = 
CONCATENATEX(
    Event_categories,
    Event_categories[Category],","
)
VAR _CountRows= 
IF(
    NOT CONTAINSSTRING(
        MAX(Event_categories[Category]),
        _Combine_cat
    ),
    COUNTX(
        VALUES(Events[ID]),
        _Combine
    ),
    BLANK()
)
VAR _Result1 = 
IF(
    _NoofselectedValues >1,
    _CountRows,    
    COUNTX( VALUES(Events[ID]),_Combine)
)
RETURN
_Result1