CREATE TABLE Dorm (dormid NUMBER, dorm_name VARCHAR2, student_capacity NUMBER, gender VARCHAR2)
CREATE TABLE Dorm_amenity (amenid NUMBER, amenity_name VARCHAR2)
CREATE TABLE Lives_in (stuid NUMBER, dormid NUMBER, room_number NUMBER)
CREATE TABLE Has_amenity (dormid NUMBER, amenid NUMBER)
CREATE TABLE Student (StuID NUMBER, LName VARCHAR2, Fname VARCHAR2, Age NUMBER, Sex VARCHAR2, Major NUMBER, Advisor NUMBER, city_code VARCHAR2)

Find the average age of male students (with sex M) from each city, show in descending by the x axis.
SELECT city_code, AVG(Age) FROM Student WHERE Sex = 'M' GROUP BY city_code ORDER BY city_code DESC
SELECT "city_code", AVG("Age") FROM "Student" WHERE "Sex" = 'M' GROUP BY "city_code" ORDER BY "city_code" DESC