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)

Give me a bar chart about the number of countries in the artist table
SELECT Country, COUNT(Country) FROM artist GROUP BY Country
SELECT "Country", COUNT("Country") FROM "artist" GROUP BY "Country"