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 NUMBER)

Return the average and minimum ages across artists from the United States.
SELECT AVG(age), MIN(age) FROM artist WHERE country = 'United States'
SELECT AVG("age"), MIN("age") FROM "artist" WHERE "country" = 'United States'