SELECT creatives.TID,
creatives.CID,
creatives.UID,
creatives.adding_date,
creatives.header,
creatives.fulltext,
categories.name as cname,
genres.name as zname,
contacts.name as uname
FROM creatives
LEFT JOIN categories USING (CID)
LEFT JOIN genres ON genres.ZID = creatives.ZID
LEFT JOIN contacts ON contacts.UID = creatives.UID
WHERE creatives.TID = '18711'
AND creatives.hidden <> 'y'
Ответ MySQL: 1054 Unknown column 'categories.name' in 'field list'
