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

Find the number of people who is under 40 for each gender, list bar in desc order please.
SELECT gender, COUNT(*) FROM Person WHERE age < 40 GROUP BY gender ORDER BY gender DESC
SELECT "gender", COUNT(*) FROM "Person" WHERE "age" < 40 GROUP BY "gender" ORDER BY "gender" DESC