SQL / PHP PDO Select random row

问题:

I'm new to PDO. I want to be able to select a STUDENT randomly who has not FACED the exam ('N') and echo the name and subject. How can I achieve this?

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

回答1:

You can use something like:

$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);