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Beer example 6
L.b(S V L) -
L.b(sV.d = L.d Ù V.k = S.k Ù S.b ¹ L.b(S ´ V ´ L))
The first part are beers liked by someone who visits a bar that serves that beer.
The second part are beers liked by someone who visits a bar that serves a different beer.
The difference are then the beers that are only liked by people who only go to bars that only serve that one beer.
Notes:
Deze query is (op een detail na) van Ivo Krooswijk (foute uitwerking van bier vraag n).