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)
CREATE TABLE exhibition (Exhibition_ID NUMBER, Year NUMBER, Theme CLOB, Artist_ID NUMBER, Ticket_Price FLOAT)

Compare all countries with a bar chart, and sort how many country in asc order.
SELECT Country, COUNT(Country) FROM artist GROUP BY Country ORDER BY COUNT(Country)
SELECT "Country", COUNT("Country") FROM "artist" GROUP BY "Country" ORDER BY COUNT("Country")