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Erreur SQL!
SELECT Jeux.url,image1,Jeux,idj AS id_jeu,Jeux.jeux,Jeux,ami,favoris_jeux.id_ressource,T2.en_favoris FROM Jeux,favoris_jeux INNER JOIN (SELECT id_ressource, COUNT(id_ressource) AS en_favoris FROM favoris_jeux GROUP BY id_ressource) T2 ON favoris_jeux.id_ressource = T2.id_ressource WHERE Jeux.idj = favoris_jeux.id_ressource AND Jeux.val = '1' AND Jeux.idj NOT IN () GROUP BY id_ressource ORDER BY en_favoris DESC LIMIT 10 ;

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') GROUP BY id_ressource ORDER BY en_favoris DESC LIMIT 10' at line 2