Need Help - Referencing columns from a different table while using Direct Query.

[Anonymous]

Hi,

I have two tables, a student table and a family table. 

The student table is as follows, where Student ID is the primary Key.

Student ID	FamilyID
1	F001
2	F002
3	F003
4	F004
5	F001

The Family table is as follows, where many family members may belong to the same family ID..

FamilyID	Member	Phone
F001	Dad	016-456-89876
F001	Mom
F001	Uncle	676-876-98543
F002	Dad
F002	Mom	412-562-88765
F003	Dad	416-542-86758
F004	Dad	416-592-86988

I need to find the list of pupils for whom any of the family member's phone no is missing. I'm using a direct query which makes creating Calculated columns and using calculate function difficult. 

I need a final output of something similar to 

Student ID	column
1	1
2	1
3	0
4	0
5	1

Can anyone help me with this?

Thanks in advance.

[V-lianl-msft · Accepted solution]

First check the data type of Phone column in the query editor to ensure that the blank field is null.

Then create a measure like below:

Measure 2 = COUNTROWS(FILTER(Family,ISBLANK(Family[Phone])))+0

[Vera_33]

Hi @Anonymous 

You need a calculated column in DAX, right? this table is called Table1, your other table is called Table2 in my sample

Column = 
VAR CurFamilyID=Table1[FamilyID]
VAR T1=CALCULATETABLE(Table2,Table2[FamilyID]=CurFamilyID)
RETURN
COUNTROWS(T1)-COUNTROWS(FILTER(T1,[Phone]<>BLANK()))