What are the details for all projects that did not hire any staff in a research role?
SELECT project_details FROM Projects WHERE project_id NOT IN ( SELECT project_id FROM Project_Staff WHERE role_code  =  'researcher' )
SELECT project_details FROM Projects WHERE project_id NOT IN ( SELECT project_id FROM Project_Staff WHERE role_code  =  'researcher' )
[{'project_details': 'porro'}, {'project_details': 'sint'}, {'project_details': 'deserunt'}, {'project_details': 'consectetur'}, {'project_details': 'omnis'}, {'project_details': 'non'}, {'project_details': 'beatae'}, {'project_details': 'dolorem'}]