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)

Compare the total number of captains with different classes using a bar graph, and display total number from low to high order.
SELECT Class, COUNT(Class) FROM captain GROUP BY Class ORDER BY COUNT(Class)
SELECT "Class", COUNT("Class") FROM "captain" GROUP BY "Class" ORDER BY COUNT("Class")