CREATE TABLE station_company (Station_ID INT, Company_ID INT, Rank_of_the_Year INT)
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)

How many companies in each headquarter? Plot a bar chart.
SELECT Headquarters, COUNT(Headquarters) FROM company GROUP BY Headquarters
SELECT "Headquarters", COUNT("Headquarters") FROM "company" GROUP BY "Headquarters"