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

What are the main industries of the companies without gas stations and what are the companies?
SELECT company, main_industry FROM company WHERE NOT company_id IN (SELECT company_id FROM station_company)
SELECT "company", "main_industry" FROM "company" WHERE NOT "company_id" IN (SELECT "company_id" FROM "station_company")