Looking up values across different tables

[pickslides]

Hi, I have two tables. One is a list of students the other a list of activities. I wish to count (in DAX) the number of distinct activities they have choosen if they are "Co-curirrcular" (Green). I have the output column in yellow and red values.

 

Thanks Q

[v-yangliu-msft]

Hi  @pickslides ,

Here are the steps you can follow：

1. Create calculated column.

TABLE Participation:

Flag1 =
var _flag1=IF(
    'TABLE Participation'[Category]="Co-Curricular Activities",1,0)
return
SUMX(
    FILTER(ALL('TABLE Participation'),
    'TABLE Participation'[Perferred]=EARLIER('TABLE Participation'[Perferred]) &&'TABLE Participation'[Category]=EARLIER('TABLE Participation'[Category]) ),_flag1)

Table Student:

Count =
var _if1=
IF(
   NOT( ISBLANK(
CALCULATE(
    MAX('TABLE Participation'[Perferred]),FILTER(ALL('TABLE Participation'),
    'TABLE Participation'[UID]='Table Student'[UID])))),
    CALCULATE(MAX('TABLE Participation'[Flag1]),FILTER(all('TABLE Participation'),'TABLE Participation'[UID]=EARLIER('Table Student'[UID]))))
    return
IF(
    _if1 =0,BLANK(),_if1)

2. Result:

Best Regards,

Liu Yang

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly

[pickslides]

A-ha.. I found a typo in the formula. Seems to work now. 

If the result is zero, cells are blank, can I populate with 0 somehow?

Q

[tamerj1]

@pickslides 

Yes you can

Count =
COUNTROWS (
    FILTER (
        Participation,
        Participation[Category] = "Co-curirrcular"
            && Participation[Preferred] = Sudent[Preferred]
    )
) + 0

[tamerj1]

@pickslides 

Two questions: do you have relationship between the two tables? Are you creating a calculated coumn in the student table?

[tamerj1]

Hi @pickslides 

please try

Count =
COUNTROWS (
    FILTER (
        Participation,
        Participation[Category] = "Co-curirrcular"
            && Participation[Preferred] = Sudent[Preferred]
    )
)

[pickslides]

This didnt work but it didnt give me an error. Thanks!

[tamerj1]

@pickslides 

Do you have any relationship between the two tables?

[pickslides]

Yes, I have a one to many relationship on the UID field