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

Give me a histogram for how old is each gender, on average?, and show by the Y-axis from high to low.
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