SQL / PHP PDO选择随机行

Question

我是PDO的新手。我希望能够随机选择一名没有参加考试的学生（'N'）并回复姓名和科目。我怎样才能做到这一点？

$query = $db->prepare('SELECT name FROM exams WHERE faced = ?');
$array = array('N');
$query->execute($array);

Answer 1

您可以使用以下内容：

$query = $db->prepare('SELECT name, subject
          FROM exams WHERE faced = ?
          ORDER BY RAND() LIMIT 1');
$array = array('N');
$query->execute($array);

$result = $query->fetchAll(PDO::FETCH_COLUMN, 0);

var_dump($result);