$sql=" FROM `mempools` AS `M` LEFT JOIN `devices` AS `D` ON `M`.`device_id` = `D`.`device_id` WHERE `D`.`device_id`=?";
$param[]=$device_id;
if(isset($searchPhrase)&&!empty($searchPhrase)){
$sql.=" AND (`D`.`hostname` LIKE '%$searchPhrase%' OR `M`.`mempool_descr` LIKE '%$searchPhrase%' OR `S.`mempool_perc` LIKE '%$searchPhrase%' OR `M`.`mempool_perc_warn` LIKE '%$searchPhrase%')";