Dynamic NOT IN list of values

[Anonymous]

Hi,

I'm new to DAX and have diffuculties with simple sintaxis.

What I am struggling to achieve is to make a dynamic list of Contacts that are not yet covered by one of the clients

Example:

ClientName     Contacts

A                      C1

A                      C2

B                      C2

B                      C4

C                      C3

D                      C4

In my report I would like to select ClientName 'A' from the slicer and then the table below would give me all Contacts that are not yet covered by ClientName 'A'.   Which would be 'C3' and 'C4'.

In SQL it would be :

SELECT

Contacts

FROM

 TableA

WHERE

 Contacts not in(SELECT Contacts FROM TableA WHERE ClientName='A')

Tried this as a reference : https://community.powerbi.com/t5/Desktop/Use-a-measure-to-check-a-column-for-an-array-list-of-values...

But ran into troubles defining my own list.

Any help would be greatly appreciated!

[M_L · Accepted solution]

Hi, this measure should list the contract ID not used by the current client by using EXCEPT on 2 columns (All contracts and contracts of the current client)

Measure contracts NOT used by current Client = 
VAR __AllContracts = DISTINCT(ALL(TableClients[Contracts]))
VAR __Currentclient = if(HASONEVALUE(TableClients[ClientName]);VALUES(TableClients[ClientName]))
VAR __ContractsCurrenctClient = SELECTCOLUMNS(FILTER(ALL(TableClients);TableClients[ClientName]=__Currentclient);"Contracts";[Contracts])
VAR __ContractsNotCurrenctClient = EXCEPT(__AllContracts;__ContractsCurrenctClient)
VAR __Results= CONCATENATEX(DISTINCT(__ContractsNotCurrenctClient);[Contracts];"-")
RETURN __Results

Results are shown below : 

Please mark if it helps. 

[Anonymous]

Thank you! Very clear explanation