CREATE TABLE Student (StuID INT, LName VARCHAR, Fname VARCHAR, Age INT, Sex VARCHAR, Major INT, Advisor INT, city_code VARCHAR)
CREATE TABLE Allergy_Type (Allergy VARCHAR, AllergyType VARCHAR)
CREATE TABLE Has_Allergy (StuID INT, Allergy VARCHAR)

Show the average age for male and female students with a bar chart, and could you list bar from high to low order?
SELECT Sex, AVG(Age) FROM Student GROUP BY Sex ORDER BY Sex DESC
SELECT "Sex", AVG("Age") FROM "Student" GROUP BY "Sex" ORDER BY "Sex" DESC NULLS LAST