修改

Question

我有一个包含member_information的表及其引用代理。我想运行一个查询，该查询返回表中的所有信息（select *），其中代理出现的次数超过3次。

我的初步查询是：

SELECT agent FROM activity GROUP BY agent ASC HAVING COUNT(agent) > 3;

这将返回所需的代理ID，但不返回“活动”中的其他数据。

我修改为：

SELECT * FROM activity GROUP BY agent ASC HAVING COUNT(agent) > 3

这只返回所需的每个代理编号的结果之一，而不是所有具有匹配代理编号的行。

我错过了什么？

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假设表结构如下：

id     |     agent     |     name     |     address 
--------------------------------------------------------
1      |      1        |     (name)   |     (an address)
2      |      1        |     (name)   |     (an address)
3      |      2        |     (name)   |     (an address)
4      |      3        |     (name)   |     (an address)
5      |      3        |     (name)   |     (an address)
6      |      3        |     (name)   |     (an address)
7      |      1        |     (name)   |     (an address)
8      |      2        |     (name)   |     (an address)
9      |      4        |     (name)   |     (an address)

查询结果应该返回：

id     |     agent     |     name     |     address 
--------------------------------------------------------
1      |      1        |     (name)   |     (an address)
2      |      1        |     (name)   |     (an address)
4      |      3        |     (name)   |     (an address)
5      |      3        |     (name)   |     (an address)
6      |      3        |     (name)   |     (an address)
7      |      1        |     (name)   |     (an address)

Answer 1

使用：

SELECT x.*
  FROM ACTIVITY x
  JOIN (SELECT t.agent 
          FROM ACTIVITY t 
      GROUP BY t.agent 
        HAVING COUNT(t.agent) > 3) y ON y.agent = x.agent

Answer 2

分组时，组中的所有行都会压缩为一个。根据您要执行的操作，您需要使用适当的组函数（SUM，GROUP_CONCAT等），或者您可以执行我认为您尝试使用子查询执行的操作：

SELECT * FROM activity WHERE agent IN (select agent from activity group by agent asc having count(agent) > 3);

SQL查询没有通过having子句返回组中的所需结果

修改

2 个答案: