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

How many people are under 40 for each gender. Show a pie chart.
SELECT gender, COUNT(*) FROM Person WHERE age < 40 GROUP BY gender
SELECT "gender", COUNT(*) FROM "Person" WHERE "age" < 40 GROUP BY "gender"