be able to ping users based on a minus of a list of roles #61
Description
https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators005.htm
MINUS | All distinct rows selected by the first query but not the second
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https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators005.htm
MINUS | All distinct rows selected by the first query but not the second