CREATE TABLE exhibition (Exhibition_ID NUMBER, Year NUMBER, Theme CLOB, Artist_ID NUMBER, Ticket_Price FLOAT)
CREATE TABLE exhibition_record (Exhibition_ID NUMBER, Date CLOB, Attendance NUMBER)
CREATE TABLE artist (Artist_ID NUMBER, Name CLOB, Country CLOB, Year_Join NUMBER, Age NUMBER)

Compare the average of artists' age by country in a bar graph, and could you show Country from low to high order?
SELECT Country, AVG(Age) FROM artist GROUP BY Country ORDER BY Country
SELECT "Country", AVG("Age") FROM "artist" GROUP BY "Country" ORDER BY "Country"