mysqli_query("SELECT z.Access,z.`Date`,z.`Header` FROM `dnevnik_zapisi` AS z, `dnevnik_tags` AS t WHERE `visible`=1 AND t.`tag`='sandrinho' AND z.`num`=t.`num` AND t.`acn`='414' AND `acn`=414 AND `Access`='all' ORDER BY z.`DateDatetime` DESC")
Column 'acn' in WHERE is ambiguous