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

Show the most common nationality of hosts.
SELECT nationality FROM host GROUP BY nationality ORDER BY COUNT(*) DESC LIMIT 1
SELECT "nationality" FROM "host" GROUP BY "nationality" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY