PDO max请求返回一个包含每行项目的数组

Question

当我使用下面的代码执行PDO请求时，我得到的结果与表格中的行数一样多，这是正常的吗？

$query3 = $bdd->prepare('select id, MAX(priority), question from questions');

$query3->execute();

$row = $query3->fetch(PDO::FETCH_ASSOC);

print_r($row);

以下是我得到的结果：

Array ( 
    [id] => 2 
    [MAX(priority)] => 117820
    [question] => Question ?
 )
Array ( 
    [id] => 2 
    [MAX(priority)] => 117820
    [question] => Question ? 
) 
Array ( 
    [id] => 2 
    [MAX(priority)] => 117820
    [question] => Question ? 
) 
Array ( 
    [id] => 2
    [MAX(priority)] => 117820
    [question] => Question ? 
) 
Array ( 
    [id] => 2 
    [MAX(priority)] => 117820
    [question] => Question ? 
)

我是否应该采取不同的措施才能在$ row中获得一个结果？

由于