# pour créer la table numcbde,gagne,perdu,effectif :

SELECT numcbde,(SELECT sum(montant*quantite) FROM transactions WHERE destinataire=main.numcbde AND valide='t') as gagne,(SELECT sum(montant*quantite) FROM transactions WHERE emetteur=main.numcbde AND valide='t') as perdu, (SELECT solde FROM adherents WHERE numcbde=main.numcbde) as effectif FROM adherents as main;

# et créer la table + en extraire seulement les gens intéressants :
# NB : c'est long à exécuter...
SELECT numcbde,gagne-perdu,effectif FROM (SELECT numcbde,(SELECT sum(montant*quantite) FROM transactions WHERE destinataire=main.numcbde AND valide='t') as gagne,(SELECT sum(montant*quantite) FROM transactions WHERE emetteur=main.numcbde AND valide='t') as perdu, (SELECT solde FROM adherents WHERE numcbde=main.numcbde) as effectif FROM adherents as main) AS calculs WHERE gagne-perdu!=effectif;