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 all main industry and total market value in each industry by a bar chart, display x-axis from high to low order.
SELECT Main_Industry, SUM(Market_Value) FROM company GROUP BY Main_Industry ORDER BY Main_Industry DESC
SELECT "Main_Industry", SUM("Market_Value") FROM "company" GROUP BY "Main_Industry" ORDER BY "Main_Industry" DESC NULLS LAST