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)

Visualize a bar chart showing the average age of captains in each class, I want to rank in asc by the x axis.
SELECT Class, AVG(age) FROM captain GROUP BY Class ORDER BY Class
SELECT "Class", AVG("age") FROM "captain" GROUP BY "Class" ORDER BY "Class" NULLS FIRST