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)

What is the total number of captains with different classes?, sort by the bars in desc.
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