sql group by 重复结果

Question

我正在尝试创建一个带有计数的制造商列表。

这是我的查询

$query = $this->pdo->prepare('SELECT manufacture, count(*) AS count
                                      FROM listed_watches
                                      GROUP BY manufacture');

但是当我执行 print_r 时，它会复制结果。显示“manufacture”和“count”的同时还显示[0]和[1]，怎么回事？

我只是想让它显示[制造]，[计数]

Array
(
    [0] => Array
        (
            [manufacture] => Audemars Piguet
            [0] => Audemars Piguet
            [count] => 2
            [1] => 2
        )

    [1] => Array
        (
            [manufacture] => Bell and Ross
            [0] => Bell and Ross
            [count] => 3
            [1] => 3
        )

    [2] => Array
        (
            [manufacture] => Bulova
            [0] => Bulova
            [count] => 1
            [1] => 1
        )

)

Answer 1

试试这个：

$result = $query->fetchAll(PDO::FETCH_ASSOC);

默认情况下，您可以在初始化连接时使用此获取方法：

$pdo_options[PDO::ATTR_DEFAULT_FETCH_MODE] = PDO::FETCH_ASSOC;