Need help with a measure

[MISgirlNY]

Hello, Power BI community, need some help. I have two tables :

Table1 and Table2 both with fields ID (Unique in each table) and Date (date format).  

Need to count how many IDs from Table2 are in Table1 with Table1.Date < '1/1/2019'

Any help is greatly appreciated!!

[Nathaniel_C]

Hi @MISgirlNY ,

Let me know if you have any questions.

If this solves your issues, please mark it as the solution, so that others can find it easily. Kudos are nice too.
Nathaniel

Date less than and in table 2 = Calculate(Count(T1[ID]) , FILTER(T1,T1[ID]=LOOKUPVALUE(T2[ID],T2[ID],T1[ID] ) && T1[Date]<Date(2019,1,3)  ))

[AlB · Accepted solution]

Hi @MISgirlNY 

Try this measure in a card visual:

Measure =
COUNTROWS (
    INTERSECT (
        CALCULATETABLE ( DISTINCT ( Table1[ID] ), Table1[Date] < DATE ( 2019, 1, 1 ) ),
        DISTINCT ( Table2[ID] )
    )
)

Please mark the question solved when done and consider giving kudos if posts are helpful.

Cheers  

[MISgirlNY]

Thank you! Good idea! I've done it differently, linked two tables by ID. But I like INTERSECT better!