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

Visualize a pie chart with what are the different classes of races, and how many races correspond to each?
SELECT Class, COUNT(*) FROM race GROUP BY Class
SELECT "Class", COUNT(*) FROM "race" GROUP BY "Class"