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

Show me a bar chart comparing the total number of captains of different classes, and rank by the Class from low to high.
SELECT Class, COUNT(Class) FROM captain GROUP BY Class ORDER BY Class
SELECT "Class", COUNT("Class") FROM "captain" GROUP BY "Class" ORDER BY "Class" NULLS FIRST