CREATE TABLE gas_station (Station_ID INT, Open_Year INT, Location TEXT, Manager_Name TEXT, Vice_Manager_Name TEXT, Representative_Name TEXT)
CREATE TABLE company (Company_ID INT, Rank INT, Company TEXT, Headquarters TEXT, Main_Industry TEXT, Sales_billion FLOAT, Profits_billion FLOAT, Assets_billion FLOAT, Market_Value FLOAT)
CREATE TABLE station_company (Station_ID INT, Company_ID INT, Rank_of_the_Year INT)

Show the number of gas stations for each manager in a bar chart, and I want to show by the X in desc.
SELECT Manager_Name, COUNT(Manager_Name) FROM gas_station GROUP BY Manager_Name ORDER BY Manager_Name DESC
SELECT "Manager_Name", COUNT("Manager_Name") FROM "gas_station" GROUP BY "Manager_Name" ORDER BY "Manager_Name" DESC NULLS LAST