SQL嵌套选择分组依据

我在SQL Server中名为“测试”的表中有一些数据：

ID  Name    Department
1   Person1 IT
2   Person2 Finance
3   Person3 IT
4   Person4 IT
5   Person5 Finance

我使用的SQL查询是：

SELECT Department AS '@Department',
(
    SELECT Name
    FROM testing
    WHERE Department = Department
    FOR XML PATH ('Person'), TYPE
)
FROM testing
GROUP BY Department
FOR XML PATH ('Department'), TYPE

现在的问题是输出没有按部门分组。取而代之的是，所有的人都包括在金融中，然后又包括在金融中

我错在哪里

提前谢谢

---

电流输出为：

<Department Department="Finance">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>
<Department Department="IT">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>

<Department Department="Finance">
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>
<Department Department="IT">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
</Department>

人1
人2
人3
人4
人5
人1
人2
人3
人4
人5

但我期望的结果是：

<Department Department="Finance">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>
<Department Department="IT">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>

<Department Department="Finance">
  <Person>
    <Name>Person2</Name>
  </Person>
  <Person>
    <Name>Person5</Name>
  </Person>
</Department>
<Department Department="IT">
  <Person>
    <Name>Person1</Name>
  </Person>
  <Person>
    <Name>Person3</Name>
  </Person>
  <Person>
    <Name>Person4</Name>
  </Person>
</Department>

人2
人5
人1
人3
人4

您需要使用别名，因为您有两个对

测试表的引用：

SELECT Department AS '@Department',
(
    SELECT Name
    FROM testing t2
    WHERE t2.Department = t.Department
    FOR XML PATH ('Person'), TYPE
)
FROM testing t
GROUP BY Department
FOR XML PATH ('Department'), TYPE

您的查询有
Department=Department
。它们都是指内部的
测试
，因此它们只选择部门的非空值