VLOOKUP Type DAX?

Hi Folks,

I need (I am assuming this has to be done via DAX) a formula that does the following:

I have two tables that are related through the following ID's Table1-WORKFLOW_ID and Table2- WF_AXN_ID

I need to return a table of values that include all records in table 1 EXCLUDING those with workflow ID's also included in table 2

Thanks in advance!