DAX: Count values based on date range from another table

[Anonymous]

I am really struggling with this one - hoping some one can help me.

In short I want to count usage (engagements) based on a contract period. I have three key tables:

Table 1: Contracts

- accountid

- contractid

- contract_start_date

- contract_end_date

Table 2: Accounts

- accountid

Table 3: Engagements

- accountid

- engagementid

- engagement_date

They are joined as such:

Contracts	-	Accounts	-	Engagements
accountid	*:1	accountid	1:*	accountid

Problem:

I want to create a measure on the contracts table that will count engagements that took place ('engagement_date') during the contract period ('contract_start_date' & 'contract_end_date').

I feel like this shouldn't be that difficult but I can't seem to get this to work. I have tried a number of things, using CountRows and Filter but often the results seem to come back incomplete. 

Does anyone have any suggestions on this. Thanks so much for help in advance! 

[Anonymous]

This worked perfectly, thank you so much Amit! You have saved me a huge headache!! Really appreciate the quick reply as well. This forum is the best 🏆

[amitchandak · Accepted solution]

@Anonymous , Try like

sumx(summarize(Accounts, Accounts[accountid], "_1", countx(filter(Engagements, Engagements[engagement_date] >= min(Contracts[contract_start_date]) && Engagements[engagement_date] <= min(Contracts[contract_start_date]) ),Engagements[engagementid])),[_1])