I still have only
the result of SeattleView:
SELECT buyer, seller,
product, store
FROM Person, Purchase, Product
WHERE Person.city = Seattle AND
Person.per-name =
Purchase.buyer AND
Purchase.product =
Product.name
but I want
to answer the query
SELECT buyer,
seller
FROM Person, Purchase
WHERE Person.city = Seattle AND
Person.per-name =
Purchase.buyer.