Question

我正在尝试计算用户在任何特定时间将拥有的潜在客户，但我收到错误MySQL返回空结果集（即零行）。但是我在users表中以及在lead表中都有数据。

表名：用户（user_id是主键）

+----------+
|  user_id |
+----------+
|    1     |
|    2     |
|    3     |
+----------+

表名：lead（id是主键，user_id是外键）

+-----------+----------+
|    id     | user_id  |
+-----------+----------+
|    1      |     1    |
|    2      |     2    |
|    3      |     3    |
+-----------+----------+

这是我的代码：

function user_leads_count() {
    return mysql_result(mysql_query("SELECT users.user_id, COUNT(leads.id) AS NumberOfLeads FROM (leads INNER JOIN users ON leads.id=users.user_id) GROUP BY id HAVING COUNT(leads.id) > 0"));
}

Answer 1

试试这个SQL

SELECT users.user_id, COUNT(leads.id) AS NumberOfLeads 
    FROM leads
    JOIN users USING (user_id)
GROUP by user
HAVING NumberOfLeads > 0

Answer 2

您是否需要引用users表，如果没有尝试这应该工作

SELECT COUNT(id) AS NumberOfLeads, user_id
FROM Leads
GROUP BY user_id
HAVING COUNT(leads.id) > 0

我需要在任何时候计算用户拥有的潜在客户数量

2 个答案: