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Padri, Madri & Figli

le tabelle e le soluzioni le trovi in
PadriMadriFigli.mdb
Query:
  1. Le persone che guadagnano più dei rispettivi padri, mostrando nome, reddito e reddito del padre. [soluzione]
  2. Massimo dei redditi per ogni gruppo di persone che sono maggiorenni ed hanno la stessa età (indicando anche l'età). [soluzione]
  3. I padri i cui figli sotto i 30 anni hanno un reddito medio maggiore di 20. [soluzione]
  4. Nome ed età delle madri che hanno almeno un figlio minorenne. [soluzione]
  5. Nome ed età delle madri che hanno almeno un figlio la cui età differisce meno di 20 anni dalla loro. [soluzione]
  6. La persona (o le persone) con il reddito massimo. [soluzione]