SELECT Nationality, COUNT(*) FROM host GROUP BY Nationality
Show different nationalities along with the number of hosts of each nationality by a pie chart.
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
)

CREATE TABLE party_host (
    Party_ID int,
    Host_ID int,
    Is_Main_in_Charge bool
)