สำนักงานใหญ่ที่มีทั้งบริษัทในภาคธนาคารและอุตสาหกรรม 'น้ำมันและก๊าซ' คืออะไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What are the headquarters that have both a company in the banking and 'oil and gas' industries?It is not neccessary to use all the tables.
 company:  company_id [ number]  rank [ number]  company [ text]  headquarters [ text]  main_industry [ text]  sales_billion [ number]  profits_billion [ number]  assets_billion [ number]  market_value [ number] 
SELECT headquarters FROM company WHERE main_industry = 'Banking' INTERSECT SELECT headquarters FROM company WHERE main_industry = 'Oil and gas'