CREATE TABLE mission (mission_id NUMBER, ship_id NUMBER, code CLOB, launched_year NUMBER, location CLOB, speed_knots NUMBER, fate CLOB)
CREATE TABLE ship (ship_id NUMBER, name CLOB, type CLOB, nationality CLOB, tonnage NUMBER)

What are the names of the ships that are not involved in any missions?
SELECT name FROM ship WHERE NOT ship_id IN (SELECT ship_id FROM mission)
SELECT "name" FROM "ship" WHERE NOT "ship_id" IN (SELECT "ship_id" FROM "mission")