CREATE TABLE party_host (Party_ID INT, Host_ID INT, Is_Main_in_Charge BOOLEAN)
CREATE TABLE host (Host_ID INT, Name TEXT, Nationality TEXT, Age TEXT)
CREATE TABLE party (Party_ID INT, Party_Theme TEXT, Location TEXT, First_year TEXT, Last_year TEXT, Number_of_hosts INT)

Show different nationalities along with the number of hosts of each nationality Visualize by bar chart, and sort the total number from low to high order.
SELECT Nationality, COUNT(*) FROM host GROUP BY Nationality ORDER BY COUNT(*)
SELECT "Nationality", COUNT(*) FROM "host" GROUP BY "Nationality" ORDER BY COUNT(*) NULLS FIRST