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SISTEMI DI BASI DI DATI - Unical...2002/04/06 · Basi di dati, Capitolo 4 42 REN B1,B2←A1,A4 (PROJ A1,A4 (SEL A2 = A3 AND A4 = C1(R1 JOIN R2 JOIN REN C1,C2 ←A1,A2 (R1)))) select
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