CREATE TABLE company (company_id NUMBER, name CLOB, headquarters CLOB, industry CLOB, sales_in_billion NUMBER, profits_in_billion NUMBER, assets_in_billion NUMBER, market_value_in_billion NUMBER)
CREATE TABLE employment (company_id NUMBER, people_id NUMBER, year_working NUMBER)
CREATE TABLE people (people_id NUMBER, age NUMBER, name CLOB, nationality CLOB, graduation_college CLOB)

What is the maximum and minimum market value of companies?
SELECT MAX(market_value_in_billion), MIN(market_value_in_billion) FROM company
SELECT MAX("market_value_in_billion"), MIN("market_value_in_billion") FROM "company"