CREATE TABLE company (company_id NUMBER, rank NUMBER, company CLOB, headquarters CLOB, main_industry CLOB, sales_billion NUMBER, profits_billion NUMBER, assets_billion NUMBER, market_value NUMBER)
CREATE TABLE station_company (station_id NUMBER, company_id NUMBER, rank_of_the_year NUMBER)
CREATE TABLE gas_station (station_id NUMBER, open_year NUMBER, location CLOB, manager_name CLOB, vice_manager_name CLOB, representative_name CLOB)

List all headquarters and the number of companies in each headquarter.
SELECT headquarters, COUNT(*) FROM company GROUP BY headquarters
SELECT "headquarters", COUNT(*) FROM "company" GROUP BY "headquarters"