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

Bar graph to show the average of age from different gender, and could you list total number in asc order?
SELECT gender, AVG(age) FROM Person GROUP BY gender ORDER BY AVG(age)
SELECT "gender", AVG("age") FROM "Person" GROUP BY "gender" ORDER BY AVG("age")