CREATE TABLE people (people_id NUMBER, age NUMBER, name CLOB, nationality CLOB, graduation_college CLOB)
CREATE TABLE employment (company_id NUMBER, people_id NUMBER, year_working NUMBER)
CREATE TABLE company (company_id NUMBER, name CLOB, headquarters CLOB, industry CLOB, sales_in_billion NUMBER, profits_in_billion NUMBER, assets_in_billion NUMBER, market_value_in_billion NUMBER)

Show the headquarters that have both companies in banking industry and companies in oil and gas industry.
SELECT headquarters FROM company WHERE industry = "Banking" INTERSECT SELECT headquarters FROM company WHERE industry = "Oil and gas"
SELECT "headquarters" FROM "company" WHERE "Banking" = "industry" INTERSECT SELECT "headquarters" FROM "company" WHERE "Oil and gas" = "industry"