$items=DB::table('report_l2_items as b')->leftJoin('report_l3_base_items as c' ,'b.id','=','c.report_l2_id')->where(['b.reprort_l1_id'=>$report->id])->get();
$items=DB::table('report_l2_items as b')->leftJoin('report_l3_base_items as c' ,'b.id','=','c.report_l2_id')->where(['b.reprort_l1_id'=>$report->id])->get();