be able to ping users based on an intersection of a list of roles #60
Description
https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators005.htm
INTERSECT | All distinct rows selected by both queries
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https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators005.htm
INTERSECT | All distinct rows selected by both queries