CREATE TABLE Person (name VARCHAR2, age NUMBER, city CLOB, gender CLOB, job CLOB)
CREATE TABLE PersonFriend (name VARCHAR2, friend VARCHAR2, year NUMBER)

Bar graph to show the average of age from different gender, could you order from high to low by the y-axis?
SELECT gender, AVG(age) FROM Person GROUP BY gender ORDER BY AVG(age) DESC
SELECT "gender", AVG("age") FROM "Person" GROUP BY "gender" ORDER BY AVG("age") DESC