CREATE TABLE country (Country_ID NUMBER, Name CLOB, Population NUMBER, Area NUMBER, Languages CLOB)
CREATE TABLE roller_coaster (Roller_Coaster_ID NUMBER, Name CLOB, Park CLOB, Country_ID NUMBER, Length FLOAT, Height FLOAT, Speed CLOB, Opened CLOB, Status CLOB)

Show the names of countries and the average speed of roller coasters from each country Plot them as bar chart, and could you show y-axis from high to low order?
SELECT T1.Name, AVG(T2.Speed) FROM country AS T1 JOIN roller_coaster AS T2 ON T1.Country_ID = T2.Country_ID GROUP BY T1.Name ORDER BY AVG(T2.Speed) DESC
SELECT "T1"."Name", AVG("T2"."Speed") FROM "country" "T1" JOIN "roller_coaster" "T2" ON "T1"."Country_ID" = "T2"."Country_ID" GROUP BY "T1"."Name" ORDER BY AVG("T2"."Speed") DESC