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

Plot the average of age by grouped by class as a bar graph, I want to order by the bar from low to high.
SELECT Class, AVG(age) FROM captain GROUP BY Class ORDER BY Class
SELECT "Class", AVG("age") FROM "captain" GROUP BY "Class" ORDER BY "Class"