MPogoda 11.10.2011 09:29 dood32

(\project_{pizzeria}((\project_{pizza}(\select_{age >= 30} (Eats \join Person))) \join Serves)) \diff (\project_{pizzeria} ((\project_{pizzeria} ((\project_{pizza} (\select_{age >= 30} (Eats \join Person))) \join Serves)) \cross (\project_{pizza} (\select_{age >= 30} (Eats \join Person))) \diff (\project_{pizzeria, pizza} (Serves))))

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