query: SELECT project_details FROM Projects WHERE project_id NOT IN ( SELECT project_id FROM Project_Staff WHERE role_code  =  'researcher' )
question: What detail all project that never hired any staff one research role?
query_toks: SELECT project_details FROM Projects WHERE project_id NOT IN ( SELECT project_id FROM Project_Staff WHERE role_code = 'researcher ' )
query_toks_no_value: select project_details from projects where project_id not in ( select project_id from project_staff where role_code = value )
question_toks: What detail all project that never hired any staff one research role?