列中的COUNT个值并生成结果表mysql

Question

提出这个问题的开头-我知道我在这里确实遗漏了一些明显的东西，但是那是星期五下午！

我正在尝试计算某些值出现在同一列中并生成结果表的次数。

到目前为止，这是我的代码：

MySQL数据库

SELECT COUNT(order_status) as printed
FROM orders WHERE order_status = 'Printed Order'

UNION

SELECT COUNT(order_status) as charged
FROM orders WHERE order_status = 'Charged Order'

UNION

SELECT COUNT(order_status) as exchanged
FROM orders WHERE order_status = 'Exchanged Order'

UNION

SELECT COUNT(order_status) as refunded
FROM orders WHERE order_status = 'Refunded Order'

UNION

SELECT COUNT(order_status) as cancelled
FROM orders WHERE order_status = 'Cancelled Order'
GROUP BY order_status

以上查询结果

printed
-------
224
19190
593
2618
2899

代码产生的数字正确，但是，我希望结果看起来如下：

所需结果

printed - 224
charged - 19190
exchanged - 593
refunded - 2618
cancelled -2899

这样，我可以通过关联数组调用即$order_status['printed']轻松引用它们

任何帮助都会很棒。

Answer 1

添加指定类型的列。 最简单的方法是使用group by ：

select order_status, count(*)
from orders o
group by order_status;

Answer 2

如果使用PDO，则通过以下方式将获取模式设置为默认创建关联数组：

$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);

Answer 3

尝试：

SELECT order_status, COUNT(order_status) as printed
FROM orders WHERE order_status = 'Printed Order'
GROUP BY order_status