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'
[{'Headquarters': 'China'}, {'Headquarters': 'UK'}, {'Headquarters': 'USA'}]