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

How many people are under 40 for each gender Plot them as bar chart, and display Y in desc order.
SELECT gender, COUNT(*) FROM Person WHERE age < 40 GROUP BY gender ORDER BY COUNT(*) DESC
SELECT "gender", COUNT(*) FROM "Person" WHERE "age" < 40 GROUP BY "gender" ORDER BY COUNT(*) DESC