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Relational algebra Esercizi

Relational algebra Esercizi. Prof. Francesco Bellotti franz@dibe.unige.it. Date le 2 relazioni R e S, istanze della relazione movieStar: movieStar(name, address, gender, birthdate) determinare R U S e R - S. R. S. Date la relazione: movieStar(name, address, gender, birthdate)

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Relational algebra Esercizi

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  1. Relational algebraEsercizi Prof. Francesco Bellotti franz@dibe.unige.it Relational Algebra

  2. Date le 2 relazioni R e S, istanze della relazione movieStar: movieStar(name, address, gender, birthdate) determinare R U S e R - S R S Relational Algebra

  3. Date la relazione: movieStar(name, address, gender, birthdate) Trovare il valore della seguente espressione: SelectGender=‘F’ AND Birthdate>1960 (movieStar) Relational Algebra

  4. Calcolare T = R JOIN S Relational Algebra

  5. Calcolare T = R JOIN A<D AND R.B !=S.B S Relational Algebra

  6. Scrivere l’espressione di query per ricavare l’anno di immatricolazione più recente di ogni modello d’aereo che è presente nella flotta di almeno 4 compagnie aeree Aerei(modelloAereo, marcaAereo, annoImm, compagniaAerea) Relational Algebra

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