ช่วยดูโค้ด UNION ALL หน่อยคะ ว่าทำไม $OPD_insurance กับ $OPD_partner ส่งค่ามาเป็น 0

$strBar="(SELECT COUNT(HNOPD_RECEIVE_HEADER.ReceiptNo) AS OPDLinegraph_general
         FROM dbo.HNOPD_PRESCRIP INNER JOIN dbo.HNOPD_RECEIVE_HEADER 
         ON dbo.HNOPD_PRESCRIP.PrescriptionNo = dbo.HNOPD_RECEIVE_HEADER.PrescriptionNo 
         AND dbo.HNOPD_PRESCRIP.VN = dbo.HNOPD_RECEIVE_HEADER.VN 
         AND HNOPD_PRESCRIP.VisitDate = dbo.HNOPD_RECEIVE_HEADER.VisitDate 
         WHERE ((HNReceiptFormCode)<>'TR' 
         AND (HNReceiptFormCode)<>'13') 
         AND (CxlByUserCode) Is Null 
         AND SUBSTRING(RightCode,1,LEN(RightCode)/2)='1' 
         AND dbo.HNOPD_PRESCRIP.VisitDate 
         BETWEEN '".$year."-".$month."-1' AND '".$year."-".$month."-".$d_bar."') 
       UNION ALL 
         (SELECT COUNT(HNOPD_RECEIVE_HEADER.ReceiptNo) AS OPDLinegraph_insurance
         FROM dbo.HNOPD_PRESCRIP INNER JOIN dbo.HNOPD_RECEIVE_HEADER 
         ON dbo.HNOPD_PRESCRIP.PrescriptionNo = dbo.HNOPD_RECEIVE_HEADER.PrescriptionNo 
         AND dbo.HNOPD_PRESCRIP.VN = dbo.HNOPD_RECEIVE_HEADER.VN 
         AND HNOPD_PRESCRIP.VisitDate = dbo.HNOPD_RECEIVE_HEADER.VisitDate 
         WHERE ((HNReceiptFormCode)<>'TR' 
         AND (HNReceiptFormCode)<>'13') 
         AND (CxlByUserCode) Is Null 
         AND SUBSTRING(RightCode,1,LEN(RightCode)/2)='2' 
         AND dbo.HNOPD_PRESCRIP.VisitDate 
         BETWEEN '".$year."-".$month."-1' AND '".$year."-".$month."-".$d_bar."') 
       UNION ALL 
         (SELECT COUNT(HNOPD_RECEIVE_HEADER.ReceiptNo) AS OPDLinegraph_partner
         FROM dbo.HNOPD_PRESCRIP INNER JOIN dbo.HNOPD_RECEIVE_HEADER 
         ON dbo.HNOPD_PRESCRIP.PrescriptionNo = dbo.HNOPD_RECEIVE_HEADER.PrescriptionNo 
         AND dbo.HNOPD_PRESCRIP.VN = dbo.HNOPD_RECEIVE_HEADER.VN 
         AND HNOPD_PRESCRIP.VisitDate = dbo.HNOPD_RECEIVE_HEADER.VisitDate 
         WHERE ((HNReceiptFormCode)<>'TR' 
         AND (HNReceiptFormCode)<>'13') 
         AND (CxlByUserCode) Is Null 
         AND (SUBSTRING(HNOPD_RECEIVE_HEADER.RightCode,1,1)='3' 
             OR SUBSTRING(HNOPD_RECEIVE_HEADER.RightCode,1,1)='4' 
             OR SUBSTRING(HNOPD_RECEIVE_HEADER.RightCode,1,1)='6')
         AND dbo.HNOPD_PRESCRIP.VisitDate 
         BETWEEN '".$year."-".$month."-1' AND '".$year."-".$month."-".$d_bar."')";

        $objBar = odbc_exec($conn,$strBar) or die ("Error SQL [".$strBar."]");

        $OPDLinegraph_general=0;
        $OPDLinegraph_insurance=0;
        $OPDLinegraph_partner=0;
        
            while($objRow = odbc_fetch_object($objBar))
            {
                //echo $strBar."<br><br>"; 
                $OPD_general = (int)$OPDLinegraph_general+$objRow->OPDLinegraph_general;
                $OPD_insurance = (int)$OPDLinegraph_insurance+$objRow->OPDLinegraph_insurance; //line 90
                $OPD_partner = (int)$OPDLinegraph_partner+$objRow->OPDLinegraph_partner; // line 91
                
                echo "OPD_general =".$OPD_general."<br>";
                echo "OPD_insurance =".$OPD_insurance."<br>";
                echo "OPD_partner =".$OPD_partner."<br>";
                
                $data[$year+543]['OPDLine_general'][$month]= $OPD_general;
                $data[$year+543]['OPDLine_insurance'][$month]= $OPD_insurance;
                $data[$year+543]['OPDLine_partner'][$month]= $OPD_partner; 
      

OPD_general =20946
OPD_insurance =0
OPD_partner =0

Notice: Undefined property: stdClass::$OPDLinegraph_insurance in D:\Apache24\htdocs\Bootstrap\Statistics\insurance.php on line 90
Notice: Undefined property: stdClass::$OPDLinegraph_partner in D:\Apache24\htdocs\Bootstrap\Statistics\insurance.php on line 91

Array
(
    [year] => Array
        (
            [0] => 2561
        )

    [2561] => Array
        (
            [month] => Array
                (
                    [0] => 1
                    [1] => 2
                    [2] => 3
                    [3] => 4
                    [4] => 5
                    [5] => 6
                    [6] => 7
                    [7] => 8
                    [8] => 9
                    [9] => 10
                    [10] => 11
                    [11] => 12
                )

            [OPDLine_general] => Array
                (
                    [1] => 13761
                    [2] => 13007
                    [3] => 14665
                    [4] => 6494
                    [5] => 0
                    [6] => 0
                    [7] => 0
                    [8] => 0
                    [9] => 0
                    [10] => 0
                    [11] => 0
                    [12] => 0
                )

            [OPDLine_insurance] => Array
                (
                    [1] => 0
                    [2] => 0
                    [3] => 0
                    [4] => 0
                    [5] => 0
                    [6] => 0
                    [7] => 0
                    [8] => 0
                    [9] => 0
                    [10] => 0
                    [11] => 0
                    [12] => 0
                )

            [OPDLine_partner] => Array
                (
                    [1] => 0
                    [2] => 0
                    [3] => 0
                    [4] => 0
                    [5] => 0
                    [6] => 0
                    [7] => 0
                    [8] => 0
                    [9] => 0
                    [10] => 0
                    [11] => 0
                    [12] => 0
                )

        )