Select CRU, Sum (Quantite)

  From   VINS V, RECOLTES R

  Where  V.NUM = R.NVIN

  Group By CRU

Nombre de tuples : 61

ou bien

  Select CRU, Sum (Quantite)

  From   VINS V JOIN RECOLTES R ON (V.NUM = R.NVIN)

  Group By CRU