CREATE TABLE company (headquarters VARCHAR, main_industry VARCHAR)

Show all headquarters with both a company in banking industry and a company in Oil and gas.
SELECT headquarters FROM company WHERE main_industry = 'Banking' INTERSECT SELECT headquarters FROM company WHERE main_industry = 'Oil and gas'
SELECT "headquarters" FROM "company" WHERE "main_industry" = 'Banking' INTERSECT SELECT "headquarters" FROM "company" WHERE "main_industry" = 'Oil and gas'