CREATE TABLE Ship (Ship_ID NUMBER, Name CLOB, Type CLOB, Built_Year FLOAT, Class CLOB, Flag CLOB)
CREATE TABLE captain (Captain_ID NUMBER, Name CLOB, Ship_ID NUMBER, age CLOB, Class CLOB, Rank CLOB)

What is the relationship between the average and minimum age of captains in different classes?
SELECT AVG(age), MIN(age) FROM captain GROUP BY Class
SELECT AVG("age"), MIN("age") FROM "captain" GROUP BY "Class"