Erreur SQL !
SELECT * FROM flux_actu WHERE theme_src="france" and id_flux_actu="540419$article=tarn-et-garonne-ejecte-de-son-tracteur-un-homme-heliporte-vers-purpan" UNION (SELECT * FROM flux_sport WHERE theme_src="france" and id_flux_sport="540419$article=tarn-et-garonne-ejecte-de-son-tracteur-un-homme-heliporte-vers-purpan") UNION (SELECT * FROM flux_tech WHERE theme_src="france" and id_flux_tech="540419$article=tarn-et-garonne-ejecte-de-son-tracteur-un-homme-heliporte-vers-purpan") UNION (SELECT * FROM flux_foot WHERE theme_src="france" and id_flux_foot="540419$article=tarn-et-garonne-ejecte-de-son-tracteur-un-homme-heliporte-vers-purpan")