我收到上述错误，但我要插入的列和数据的计数均为 19

try {
    $db = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $sql = "INSERT INTO prescriptions (
        rxID, rxPrimeName, rxAltName, patient, prescriber, dpp, dppMetric, totalDailyDosage, 
        totalDailyPills, frequency, freqMetric, am, noon, pm, bed, prn, pharmacy, lastFill, pills
        )
    VALUES 
        (
        '$rxID', '$drugName1', '$drugName2', '$patient', '$prescriber', '$dpp', '$metric', '$totalDailyDosage,
        $totalDailyPills', '$quantity', '$frequency', '$am', '$noon', '$pm', '$bed', '$prn', '$pharmacy', '$lastFill', '$pills'
        )";
    $db->exec($sql);
    echo "New record created successfully";
} catch (PDOException $e) {
    echo $sql . "<br>" . $e->getMessage();
}
$db = null;

这是我收到的确切错误：

插入 prescriptions ( rxID, rxPrimeName, rxAltName, 病人, prescriber, dpp, phpcn cphpcndppMetric、totalDailyDosage、totalDailyPills、频率、freqMetric、am、noon 、pm phpcnendc phpcn、bed、prn、pharmacy、lastFill、pills ) 值 ('1111111' , '测试1', '测试2', '乔丹', '测试3', '50', '毫克', '100, 2', '1', 'BID', '1', '1', '0' , '0', '0', 'KJdh', '2022-04-15', '60') SQLSTATE[21S01]：插入值列表与列列表不匹配：1136 列计数与第 1 行的值计数不匹配

插入prescriptions（keyID，rxID，rxPrimeName，rxAltName，病人，prescriber，phpcnc phpcndpp、dppMetric、totalDailyDosage、totalDailyPills、频率、freqMetric、am、noonphpcnendc phpcn、pm、bed、prn、pharmacy、lastFill、pills) 值 (NULL , '1234567', '测试1', '测试2', '乔丹', '测试3', '30', '毫克', '60', '2', '1', 'BID', '1', ' 1', '0', '0', '0', '中庭', '2022-04-15', '60');