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Helper I
Helper I

Left outer join with exclusion from two arrays



I am completely stumped.  How would one perform a left exclusive join from two arrays?


Example data:


Array 1 (sourced from a SharePoint list) : 

[ Eric, John, Mike ]


Array 2 (sourced from active directory -- all users)

[ Mary, Sally, Eric, Arnold, John, Mike, Jen, ...]


The goal is to identify users from array 2 that are not present in array 1.


I watched this video and it was insightful, but i dont completely understand it and am not sure if it the right join type.


Update: The names from the SharePoint list are 'Person' type records sourced from AD.  Perhaps there are some ID's that can used since array 2 is also sourced from AD?








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