CREATE TABLE products (code NUMBER, name CLOB, price NUMBER, manufacturer NUMBER)
CREATE TABLE manufacturers (code NUMBER, name CLOB, headquarter CLOB, founder CLOB, revenue NUMBER)

Find the total revenue created by the companies whose headquarter is located at Austin.
SELECT SUM(revenue) FROM manufacturers WHERE headquarter = 'Austin'
SELECT SUM("revenue") FROM "manufacturers" WHERE "headquarter" = 'Austin'