如何使用 mysql phpmyadmin 对三个表中的记录进行计数和求和？

Question

我是这个社区的新手，也是 MySQL 的新手。

需要COUNT客户和SUM每个推荐人的佣金分别使用MySQL查询。

推荐人table

id	referrer_name
1	referre1
2	referre2
3	referre3
4	referre4

客户table

id	referrer_id	client_name
1	1	client1
2	1	client2
3	2	client3
4	3	client4
5	4	client5

佣金table

id	client_id	commission
1	1	20
2	1	32
3	3	24
4	4	15

我想使用以上 3 tables 实现以下输出。

referrer_id	referrer_name	total_client	total_commission
1	referre1	2	52
2	referre2	1	24
3	referre3	1	15
4	referre4	1	0

我试过以下查询

 SELECT referrer.referrer_name as name,
(SELECT COUNT(*) FROM client WHERE client.referrer_id=referrer.id) as total_client,
(SELECT SUM(commission) FROM commission WHERE commission.client_id=client.id) as total_commission FROM referrer LEFT JOIN client ON client.referrer_id=referrer.id GROUP BY name;

Answer 1

阅读Mysql join and Aggregate Functions

SELECT t2.referrer_id,
       t1.referrer_name,
       COUNT(DISTINCT t2.id) AS total_client,
       SUM(t3.commission)                 AS total_commission
FROM referrer t1
         JOIN client t2 ON t1.id = t2.referrer_id
         JOIN commission t3 ON t2.id = t3.client_id
GROUP BY t1.referrer_id

如何使用 mysql phpmyadmin 对三个表中的记录进行计数和求和？

how count and sum records in three tables using mysql phpmyadmin?

mysql

phpmyadmin