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

Show me a bar chart comparing the total number of captains of different classes, I want to order by the x axis from high to low.
SELECT Class, COUNT(Class) FROM captain GROUP BY Class ORDER BY Class DESC
SELECT "Class", COUNT("Class") FROM "captain" GROUP BY "Class" ORDER BY "Class" DESC NULLS LAST