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

Compare the average of artists' age by country in a bar graph, could you rank in ascending by the total number?
SELECT Country, AVG(Age) FROM artist GROUP BY Country ORDER BY AVG(Age)
SELECT "Country", AVG("Age") FROM "artist" GROUP BY "Country" ORDER BY AVG("Age") NULLS FIRST