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

Return a histogram on what are the nationalities and the total ages of journalists?, and I want to show by the total number of age in desc.
SELECT Nationality, SUM(Age) FROM journalist GROUP BY Nationality ORDER BY SUM(Age) DESC
SELECT "Nationality", SUM("Age") FROM "journalist" GROUP BY "Nationality" ORDER BY SUM("Age") DESC