CREATE TABLE party (party_id DECIMAL, party_theme TEXT, location TEXT, first_year TEXT, last_year TEXT, number_of_hosts DECIMAL)
CREATE TABLE host (host_id DECIMAL, name TEXT, nationality TEXT, age TEXT)
CREATE TABLE party_host (party_id DECIMAL, host_id DECIMAL, is_main_in_charge others)

Compute the average number of hosts for parties.
SELECT AVG(number_of_hosts) FROM party
SELECT AVG("number_of_hosts") FROM "party"