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

What is the average age for each gender Visualize by bar chart, and could you rank by the x-axis in descending?
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