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 gas_station (station_id NUMBER, open_year NUMBER, location CLOB, manager_name CLOB, vice_manager_name CLOB, representative_name CLOB)
CREATE TABLE station_company (station_id NUMBER, company_id NUMBER, rank_of_the_year NUMBER)

Show minimum, maximum, and average market value for all companies.
SELECT MIN(market_value), MAX(market_value), AVG(market_value) FROM company
SELECT MIN("market_value"), MAX("market_value"), AVG("market_value") FROM "company"