CREATE TABLE Engineer_Visits (first_name VARCHAR, last_name VARCHAR, engineer_id VARCHAR)
CREATE TABLE Maintenance_Engineers (first_name VARCHAR, last_name VARCHAR, engineer_id VARCHAR)

Which engineers have never visited to maintain the assets? List the engineer first name and last name.
SELECT first_name, last_name FROM Maintenance_Engineers WHERE NOT engineer_id IN (SELECT engineer_id FROM Engineer_Visits)
SELECT "first_name", "last_name" FROM "Maintenance_Engineers" WHERE NOT "engineer_id" IN (SELECT "engineer_id" FROM "Engineer_Visits")