Erreur SQL !
SELECT * FROM flux_actu WHERE theme_src="monde" and id_flux_actu="554298$article=les-etats-unis-donnent-leur-accord-a-une-offensive-turque-en-syrie" UNION (SELECT * FROM flux_sport WHERE theme_src="monde" and id_flux_sport="554298$article=les-etats-unis-donnent-leur-accord-a-une-offensive-turque-en-syrie") UNION (SELECT * FROM flux_tech WHERE theme_src="monde" and id_flux_tech="554298$article=les-etats-unis-donnent-leur-accord-a-une-offensive-turque-en-syrie") UNION (SELECT * FROM flux_foot WHERE theme_src="monde" and id_flux_foot="554298$article=les-etats-unis-donnent-leur-accord-a-une-offensive-turque-en-syrie")