SQL查詢未通過Have子句在組中返回期望的結果

Question

我有一張帶有member_information及其引薦代理的表格。 我想運行一個查詢，該查詢返回表中所有信息的信息（選擇*），其中代理出現3次以上。

我最初的查詢是：

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

這將返回所需的業務代表ID，但不會返回“活動”中的其余數據。

我修改為：

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

這僅針對所需的每個業務代表號返回結果之一，而不是所有具有匹配業務代表號的行。

我想念什么？

編輯

假設表結構如下：

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)

查詢結果應返回：

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

采用：

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

分組時，組中的所有行都壓縮為一個。 根據您要執行的操作，您需要使用適當的組函數（SUM，GROUP_CONCAT等），或者可以執行我認為要使用子查詢執行的操作：

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