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

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