-- Database schema
| Manufacturers : Code [ INT ] primary_key , Name [ TEXT ] , Headquarter [ TEXT ] , Founder [ TEXT ] , Revenue [ INT ] | Products : Code [ INT ] primary_key , Name [ TEXT ] , Price [ INT ] , Manufacturer [ INT ] Products.Manufacturer = Manufacturers.Code |
-- -- Return the total revenue of companies with headquarters in Tokyo or Taiwan.

SELECT sum(revenue) FROM manufacturers WHERE Headquarter  =  'Tokyo' OR Headquarter  =  'Taiwan';