Ho provato con queste 3 soluzioni:


$sql="SELECT * FROM ((SELECT * FROM eventi WHERE ordine='01') UNION (SELECT * FROM notizie WHERE ordine='01')) ORDER data_ins desc LIMIT 0,1";

$sql="SELECT * FROM ((SELECT * FROM eventi) UNION (SELECT * FROM notizie)) WHERE ordine='01' ORDER data_ins desc LIMIT 0,1";

$sql="((SELECT * FROM eventi) UNION (SELECT * FROM notizie)) WHERE ordine='01' ORDER data_ins desc LIMIT 0,1";

Niente da fare, mi da continuamente errore.