CREATE TABLE race (Race_ID INT, Name TEXT, Class TEXT, Date TEXT, Track_ID TEXT)
CREATE TABLE track (Track_ID INT, Name TEXT, Location TEXT, Seating FLOAT, Year_Opened FLOAT)

What are the different classes of races, and how many races correspond to each Show bar chart, order from low to high by the total number.
SELECT Class, COUNT(*) FROM race GROUP BY Class ORDER BY COUNT(*)
SELECT "Class", COUNT(*) FROM "race" GROUP BY "Class" ORDER BY COUNT(*) NULLS FIRST