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+ $join[] = ['table'=>'(select t1.* from realtime_info_log t1, (select lampid, max(updatetime) as maxtime from realtime_info_log group by lampid) t2 where t1.lampid = t2.lampid and t1.updatetime = t2.maxtime) as RI', 'cond'=>'L.id = RI.lampid', 'type'=>'left'];
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$data['lamps'] = $this->Lamp_model->get_list_by_join($filter, $fields,$limit, $offset, $join, "L.number ASC", NUll, 'L');
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