我有4个表，比如
+----+----------+
| id | username |
+----+----------+
| 1 | sankar |
| 2 | jenifer |
| 3 | andrew |
| 4 | nirmal |
| 5 | raja |
+----+----------+
+----+-----------+
| id | name |
+----+-----------+
| 1 | sankar |
| 2 | nirmal |
| 3 | jenifer |
| 4 | raja |
| 5 | sankar |
| 6 | office |
| 7 | andrew |
| 8 | sabarish |
| 9 | saravanan |
+----+-----------+
+----+-------------+--------------+
| 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 |
+----+-------------+--------------+
+----+-------------+--------------+-------------------+----------------------+
| 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 |
+----+-------------+--------------+-------------------+----------------------+
我执行sql查询是
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
我正在寻找这样的输出：
+------------+---------------+-----------+------------+---------------+
| 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 |
+------------+---------------+-----------+------------+---------------+
代理商名称，总短信，邮件总数和总快递数据运作良好......
但我收到此错误“子查询返回超过1行”，当我不需要调用者
时请帮助我解决它
答案 0 :(得分：1)
将您的查询更改为：
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