Sql无法正确调用字段

Question

php / sql调用此：

<?php
// Filter our input.
$pID = filter_input(INPUT_GET, 'pID', FILTER_SANITIZE_NUMBER_INT);
if(!$pID) {
    echo "No pID specified.";
    exit;
}
$username = "##";
$password = "####";
$pdo = new PDO('mysql:host=localhost;dbname=###', $username, $password);
$pdo->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$sth = $pdo->prepare('
SELECT name, lname, fname, picpath, email
FROM Department, Professor
WHERE pID = ?

    ;');
$sth->execute(array(
    $pID
));

其他php代码：

if($sth->rowCount() > 0) {
                        $row = $sth->fetch(PDO::FETCH_ASSOC);                  
     <div class='professor_pic'>
                            <img src='{$row['picpath']}' />
                        </div><!-- /professor_pic -->
                        <div class='professor_desc'>
                            <span class='one' style='float:left; padding:5px 0 0 5px;'><strong>Department:</strong> {$row['name']} </span><br>

    } else {
                        echo "No results.";
                    }
                    unset($sth);
                    ?>

为什么这两个字段'picpath'和'name'不被拉？它没有抛出任何错误。以上是两个数据库字段：

Answer 1

我怀疑你的初始SQL查询有很多错误。

我建议您阅读MySQL JOIN。考虑到我理解该查询应该如何运行，请尝试：

SELECT d.name, p.lname, p.fname, p.picpath, p.email FROM Professor p JOIN Department d ON d.dID = p.dID WHERE p.pID = ?