CREATE TABLE cinema (Cinema_ID NUMBER, Name CLOB, Openning_year NUMBER, Capacity NUMBER, Location CLOB)
CREATE TABLE schedule (Cinema_ID NUMBER, Film_ID NUMBER, Date CLOB, Show_times_per_day NUMBER, Price FLOAT)
CREATE TABLE film (Film_ID NUMBER, Rank_in_series NUMBER, Number_in_season NUMBER, Title CLOB, Directed_by CLOB, Original_air_date CLOB, Production_code CLOB)

Can you draw the trend of the average of capacity over the openning year?, and sort by the x axis in desc.
SELECT Openning_year, AVG(Capacity) FROM cinema ORDER BY Openning_year DESC
SELECT "Openning_year", AVG("Capacity") FROM "cinema" ORDER BY "Openning_year" DESC