mysql小技巧 用rand()写随机查询

if ($intelligent_count > 1) {
            //随机抽取推荐菜单
            $intelligent = pdo_fetch("SELECT * FROM " . tablename($this->modulename . '_intelligent') . " WHERE name=:name AND weid=:weid AND storeid=:storeid AND id<>:id ORDER BY RAND() limit 1", array(':name' => $num, ':weid' => $weid, ':storeid' => $storeid, ':id' => $intelligentid));
        } else {
            $intelligent = pdo_fetch("SELECT * FROM " . tablename($this->modulename . '_intelligent') . " WHERE name=:name AND weid=:weid AND storeid=:storeid ORDER BY RAND() limit 1", array(':name' => $num, ':weid' => $weid, ':storeid' => $storeid));
        }