MySQL Количество подзапросов, где и группа по

Question

У меня есть 4 таблицы, как

cc_agents

+----+----------+ 
| id | username | 
+----+----------+ 
| 1 | sankar | 
| 2 | jenifer | 
| 3 | andrew | 
| 4 | nirmal | 
| 5 | raja  | 
+----+----------+ 

cc_callers

+----+-----------+ 
| id | name | 
+----+-----------+ 
| 1 | sankar | 
| 2 | nirmal | 
| 3 | jenifer | 
| 4 | raja  | 
| 5 | sankar | 
| 6 | office | 
| 7 | andrew | 
| 8 | sabarish | 
| 9 | saravanan | 
+----+-----------+ 

cc_caller_requirement

+----+-------------+--------------+ 
| id | cc_agent_id | cc_caller_id | 
+----+-------------+--------------+ 
| 1 |   1 |   5 | 
| 2 |   1 |   5 | 
| 3 |   1 |   2 | 
| 4 |   1 |   2 | 
| 5 |   1 |   7 | 
| 6 |   4 |   2 | 
| 14 |   1 |   2 | 
| 13 |   5 |   2 | 
| 12 |   5 |   2 | 
| 15 |   1 |   8 | 
| 16 |   1 |   9 | 
+----+-------------+--------------+ 

cc_notifications

+----+-------------+--------------+-------------------+----------------------+ 
| id | cc_agent_id | cc_caller_id | cc_requirement_id | cc_notification_type | 
+----+-------------+--------------+-------------------+----------------------+ 
| 1 | 1   | 5   | 1     | sms     | 
| 2 | 1   | 5   | 1     | mail     | 
| 3 | 1   | 5   | 1     | courier    | 
| 4 | 1   | 5   | 2     | sms     | 
| 5 | 1   | 5   | 2     | mail     | 
| 6 | 1   | 2   | 3     | sms     | 
| 7 | 1   | 2   | 4     | sms     | 
| 8 | 1   | 2   | 4     | mail     | 
| 9 | 1   | 2   | 4     | courier    | 
| 10 | 1   | 7   | 5     | mail     | 
| 11 | 1   | 7   | 5     | courier    | 
| 12 | 4   | 2   | 6     | sms     | 
| 13 | 4   | 2   | 6     | mail     | 
| 14 | 4   | 2   | 6     | courier    | 
| 30 | 5   | 2   | 12    | sms     | 
| 31 | 5   | 2   | 12    | mail     | 
| 32 | 5   | 2   | 12    | courier    | 
| 33 | 5   | 2   | 13    | sms     | 
| 34 | 5   | 2   | 13    | mail     | 
| 35 | 5   | 2   | 13    | courier    | 
| 36 | 1   | 2   | 14    | sms     | 
| 37 | 1   | 8   | 15    | sms     | 
| 38 | 1   | 8   | 15    | mail     | 
| 39 | 1   | 9   | 16    | sms     | 
| 40 | 1   | 9   | 16    | mail     | 
+----+-------------+--------------+-------------------+----------------------+ 

я выполнить SQL запрос

SELECT cca.id, cca.username, 
    (SELECT COUNT(cccr.id) 
    FROM cc_caller_requirements AS cccr 
    WHERE cccr.cc_agent_id = cca.id 
    GROUP BY cccr.cc_caller_id) AS num_of_callers, 
    (SELECT COUNT(ccns.id) 
    FROM cc_notifications AS ccns 
    WHERE ccns.cc_agent_id = cca.id 
    AND ccns.cc_notification_type_id = 'sms') AS sms, 
    (SELECT COUNT(ccnm.id) 
    FROM cc_notifications AS ccnm 
    WHERE ccnm.cc_agent_id = cca.id 
    AND ccnm.cc_notification_type_id = 'mail') AS mail, 
    (SELECT COUNT(ccna.id) 
    FROM cc_notifications AS ccna 
    WHERE ccna.cc_agent_id = cca.id 
    AND ccna.cc_notification_type_id = 'courier') AS courier 
FROM cc_agents AS cca 
GROUP BY cca.id 

Я ищу выход, как это: имя

+------------+---------------+-----------+------------+---------------+ 
| agent name | no of callers | total sms | total mail | total courier | 
+------------+---------------+-----------+------------+---------------+ 
| sankar  | 5    | 7   | 6   | 3    | 
| jenifer | 0    | 0   | 0   | 0    | 
| andrew  | 0    | 0   | 0   | 0    | 
| nirmal  | 1    | 1   | 1   | 1    | 
| raja  | 1    | 2   | 2   | 2    | 
+------------+---------------+-----------+------------+---------------+ 

агента, общее смс, общая почта и общие данные курьера работают хорошо. ..

но я получаю эту ошибку «Подзапрос возвращает более 1 строки», когда я не хочу никого из вызывающих абонентов

Просьба помочь мне решить это

Answer 1

Изменить свой запрос:

SELECT cca.id, cca.username, 
    (SELECT COUNT(DISTINCT cccr.cc_caller_id) 
    FROM cc_caller_requirements AS cccr 
    WHERE cccr.cc_agent_id = cca.id 
    ) AS num_of_callers, 
    (SELECT COUNT(ccns.id) 
    FROM cc_notifications AS ccns 
    WHERE ccns.cc_agent_id = cca.id 
    AND ccns.cc_notification_type_id = 'sms') AS sms, 
    (SELECT COUNT(ccnm.id) 
    FROM cc_notifications AS ccnm 
    WHERE ccnm.cc_agent_id = cca.id 
    AND ccnm.cc_notification_type_id = 'mail') AS mail, 
    (SELECT COUNT(ccna.id) 
    FROM cc_notifications AS ccna 
    WHERE ccna.cc_agent_id = cca.id 
    AND ccna.cc_notification_type_id = 'courier') AS courier 
FROM cc_agents AS cca 
GROUP BY cca.id