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Example
List all drinkers who visit a bar that serves a beer they like.
- RA: V.d(V S L)
- Step 1: V.d( V.k=S.kS.b=L.bV.d=L.d(V S L))
- Step 2: The relations are translated to
- { v | vV } { s | sS } { l | lL }
- Step 3: We first translate the product, then the selection and then the projection.
Notes: