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

A bar chart about what is average age for different job title?, I want to display by the bars in descending.
SELECT job, AVG(age) FROM Person GROUP BY job ORDER BY job DESC
SELECT "job", AVG("age") FROM "Person" GROUP BY "job" ORDER BY "job" DESC NULLS LAST