[MySQL] Select campi uguali su più tabelle

[wartpro]

Grazie Joe ma non mi funziona..guarda, invio la seguente query:

SELECT id,website,category_name_it,nation,timestamp (
  SELECT id,website,category_name_it,nation,timestamp FROM tabella1 
    UNION 
  SELECT id,website,category_name_it,nation,timestamp FROM tabella2 ) AS unione 
    ORDER BY unione.timestamp DESC LIMIT 3;