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

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"