CREATE TABLE journalist (journalist_ID INT, Name TEXT, Nationality TEXT, Age TEXT, Years_working INT)
CREATE TABLE event (Event_ID INT, Date TEXT, Venue TEXT, Name TEXT, Event_Attendance INT)
CREATE TABLE news_report (journalist_ID INT, Event_ID INT, Work_Type TEXT)

A bar chart about what are the nationalities and their average ages of journalists?, and rank X-axis from high to low order please.
SELECT Nationality, AVG(Age) FROM journalist GROUP BY Nationality ORDER BY Nationality DESC
SELECT "Nationality", AVG("Age") FROM "journalist" GROUP BY "Nationality" ORDER BY "Nationality" DESC NULLS LAST