 What is the name of the youngest captain?
CREATE TABLE ship (
    ship_id number,
    name text,
    type text,
    built_year number,
    class text,
    flag text
)

CREATE TABLE captain (
    captain_id number,
    name text,
    ship_id number,
    age text,
    class text,
    rank text
)
SELECT name FROM captain ORDER BY age LIMIT 1