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

Draw a bar chart for what is the average age for each gender?, and I want to show by the bars in desc.
SELECT gender, AVG(age) FROM Person GROUP BY gender ORDER BY gender DESC
SELECT "gender", AVG("age") FROM "Person" GROUP BY "gender" ORDER BY "gender" DESC