Question

我有一个客户表和一个订单表我想要计算有多少活跃客户已经制作了超过3个订单，表的结构是这样的：

Customer table

customer_id, name, active

orders table

order_id, details, customer_id

任何帮助？

Answer 1

试试这个：

SELECT c.customer_id,
       c.name
  FROM Customer AS c
  INNER JOIN orders as o
     ON o.customer_id = c.customer_id
  WHERE c.active
  GROUP BY c.customer_id,
           c.name
  HAVING COUNT(c.customer_id) > 3

MySql获得了超过3个订单的客户数量

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