Select d1, z1 from Z, Y, D where D.id_y = Y.id_y and D.id_z=Z.id...
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Select d1, z1 from Z, Y, D where D.id_y = Y.id_y and D.id_z=Z.id_z (jointure) and y1 = ‘a’ and d1 <> ‘e’
Cette requête ne renvoie qu’une seule ligne, séparer les valeurs des colonnes par une virgule ; ex : a, b
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