CREATE TABLE performance (performance_id NUMBER, date CLOB, host CLOB, location CLOB, attendance NUMBER)
CREATE TABLE member_attendance (member_id NUMBER, performance_id NUMBER, num_of_pieces NUMBER)
CREATE TABLE member (member_id CLOB, name CLOB, nationality CLOB, role CLOB)

What is the average number of attendees for performances?
SELECT AVG(attendance) FROM performance
SELECT AVG("attendance") FROM "performance"