Tsql 如何递归地选择父元素下的所有子元素？

假设我们有一张桌子：

WORKER  
NAME     ID    ManagerID  
------------------------
John     1     3  
Sally    2     3  
Paul     3     4  
Jane     4     5  
Jennifer 5     8  

约翰和莎莉为保罗工作，保罗为简工作

对于SQL查询，我希望向它提供Jane的ID（4），并让它返回她的所有下属：

John     1     3  
Sally    2     3  
Paul     3     4

我还需要让这个查询递归地深入到所需的深度。例如，也许约翰有人为他工作，所以他们也会被包括在结果中

---

---

您将如何构建此查询

此页面显示如何使用TSQL将其组合在一起：

---

此页面显示如何使用TSQL将其组合在一起：

---

您可以使用简单的递归cte，如下所示：

;With cte as (
    Select * from YourWorker where ManagerId = 4

    union all

    select y.WorkerName, y.Id, y.ManagerId from YourWorker y inner join cte c
    on y.ManagerId = c.Id
)
select * from cte

+------------+----+-----------+
| WorkerName | Id | ManagerId |
+------------+----+-----------+
| Paul       |  3 |         4 |
| John       |  1 |         3 |
| Sally      |  2 |         3 |
+------------+----+-----------+

输出如下：

;With cte as (
    Select * from YourWorker where ManagerId = 4

    union all

    select y.WorkerName, y.Id, y.ManagerId from YourWorker y inner join cte c
    on y.ManagerId = c.Id
)
select * from cte

+------------+----+-----------+
| WorkerName | Id | ManagerId |
+------------+----+-----------+
| Paul       |  3 |         4 |
| John       |  1 |         3 |
| Sally      |  2 |         3 |
+------------+----+-----------+

---

您可以使用简单的递归cte，如下所示：

;With cte as (
    Select * from YourWorker where ManagerId = 4

    union all

    select y.WorkerName, y.Id, y.ManagerId from YourWorker y inner join cte c
    on y.ManagerId = c.Id
)
select * from cte

+------------+----+-----------+
| WorkerName | Id | ManagerId |
+------------+----+-----------+
| Paul       |  3 |         4 |
| John       |  1 |         3 |
| Sally      |  2 |         3 |
+------------+----+-----------+

输出如下：

;With cte as (
    Select * from YourWorker where ManagerId = 4

    union all

    select y.WorkerName, y.Id, y.ManagerId from YourWorker y inner join cte c
    on y.ManagerId = c.Id
)
select * from cte

+------------+----+-----------+
| WorkerName | Id | ManagerId |
+------------+----+-----------+
| Paul       |  3 |         4 |
| John       |  1 |         3 |
| Sally      |  2 |         3 |
+------------+----+-----------+