CREATE TABLE PersonFriend (name VARCHAR, friend VARCHAR, year INT)
CREATE TABLE Person (name VARCHAR, age INT, city TEXT, gender TEXT, job TEXT)

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 NULLS LAST