Invalid query: SELECT vk.start, vk.end, k.tit FROM n470_VID_key AS vk JOIN n470_VID_key AS vk2 ON vk.kid=vk2.kid AND vk2.vid!=K JOIN n470_KEYWORD AS k ON vk.kid=k.id WHERE vk.vid=K AND vk.kid!=134 AND vk.start!='0:0:0:0' GROUP BY(vk2.kid) ORDER BY vk.`start` Unknown column 'K' in 'where clause'