CREATE TABLE scientists (ssn DECIMAL, name TEXT)
CREATE TABLE projects (code TEXT, name TEXT, hours DECIMAL)
CREATE TABLE assignedto (scientist DECIMAL, project TEXT)

Find the name of scientists who are not assigned to any project.
SELECT name FROM scientists WHERE NOT ssn IN (SELECT scientist FROM assignedto)
SELECT "name" FROM "scientists" WHERE NOT "ssn" IN (SELECT "scientist" FROM "assignedto")