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

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