CREATE TABLE companies (id NUMBER, name CLOB, headquarters CLOB, industry CLOB, sales_billion NUMBER, profits_billion NUMBER, assets_billion NUMBER, market_value_billion CLOB)
CREATE TABLE buildings (id NUMBER, name CLOB, city CLOB, height NUMBER, stories NUMBER, status CLOB)
CREATE TABLE office_locations (building_id NUMBER, company_id NUMBER, move_in_year NUMBER)

How many different industries are the companies in?
SELECT COUNT(DISTINCT industry) FROM companies
SELECT COUNT(DISTINCT "industry") FROM "companies"