CREATE TABLE Has_Allergy (StuID INT, Allergy VARCHAR)
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)

Show all allergy types and the number of allergies in each type in a bar chart, and show in descending by the total number please.
SELECT AllergyType, COUNT(*) FROM Allergy_Type GROUP BY AllergyType ORDER BY COUNT(*) DESC
SELECT "AllergyType", COUNT(*) FROM "Allergy_Type" GROUP BY "AllergyType" ORDER BY COUNT(*) DESC NULLS LAST