如何使用 group by 获取每个类别的计数？

Question

我正在使用 cakephp 2.0 框架。我想统计每个类别的记录数。这里我有两个表

eve_appointment_icons ->having columns- appointment_icon_id,appointment_icon_type_name
eve_appointments ->having columns- id, appointment_icon_id

我已使用此查询获取此数据：-

$this->EveAppointment->query("SELECT
                    a.appointment_type
                    d.appointment_icon_id,
                    a.appointment_icon_id , 
                    d.appointment_icon_type_name,   
                FROM  eve_appointments a,
                    eve_appointment_icons d
                WHERE  a.appointment_type =1
                AND d.appointment_icon_id = a.appointment_icon_id

            UNION
                SELECT 
                    a.appointment_type
                    d.appointment_icon_id,
                    a.appointment_icon_id , 
                    d.appointment_icon_type_name,   

                FROM  eve_appointments a,
                    eve_appointment_icons d
                WHERE  a.appointment_type =2
                    AND d.appointment_icon_id = a.appointment_icon_id
            UNION
                SELECT 
                    a.appointment_type
                    d.appointment_icon_id,
                    a.appointment_icon_id , 
                    d.appointment_icon_type_name, 
                FROM  eve_appointments a,
                    eve_appointment_icons d
                WHERE a.appointment_type =3
                    AND d.appointment_icon_id = a.appointment_icon_id");

当我打印这个时：

Array
(
[0] => Array
    (
        [appointment_icon_id] => 1
        [appointment_icon_type_name] => Yoga
    )
[1] => Array
    (
        [appointment_icon_id] => 1
        [appointment_icon_type_name] => Yoga
    )

[2] => Array
    (
        [appointment_icon_id] => 2
        [appointment_icon_type_name] => Visit
    )
[3] => Array
    (
        [appointment_icon_id] => 3
        [appointment_icon_type_name] => Physio Therapy
    )

[4] => Array
    (
        [appointment_icon_id] => 4
        [appointment_icon_type_name] => Diagnostic
    )
[5] => Array
    (
        [appointment_icon_id] => 4
        [appointment_icon_type_name] => Diagnostic
    )
[6] => Array
    (
        [appointment_icon_id] => 4
        [appointment_icon_type_name] => Diagnostic
    )
)

现在您可以看到 appointment_icon_id 的 Yoga 是 1，请访问 appointment_icon_id 2，反之亦然。我想要计算所有这些类别。喜欢：

appointment_icon_type_name    count
 Yoga                           2
 Visit                          1
 Physio Therapy                 1
 Diagnostic                     3

Answer 1

你只需要这个：

select d.appointment_icon_type_name, count(*)   
FROM  eve_appointments a,
eve_appointment_icons d
WHERE d.appointment_icon_id = a.appointment_icon_id
group by d.appointment_icon_type_name

如何使用 group by 获取每个类别的计数？

How to get the count of each category using group by?

php

sql

cakephp-2.0