TSQL 递归更新？

发布于 2024-10-05 13:51:39 字数 249 浏览 2 评论 0原文

我想知道 tsql (CTE) 中是否存在递归更新，

ID  parentID value
--  -------- -----
1   NULL     0
2   1        0
3   2        0
4   3        0
5   4        0
6   5        0

是否可以使用例如 CTE 从 ID = 6 到最上面行递归更新列 value ？

原文

I'm wondering if exists a recursive update in tsql (CTE)

ID  parentID value
--  -------- -----
1   NULL     0
2   1        0
3   2        0
4   3        0
5   4        0
6   5        0

I it possible to update the column value recursively using e.g CTE from ID = 6 to the top most row ?

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梦中楼上月下 2024-10-12 13:51:39

是的，应该如此。 MSDN 给出了一个示例：

USE AdventureWorks;
GO
WITH DirectReports(EmployeeID, NewVacationHours, EmployeeLevel)
AS
(SELECT e.EmployeeID, e.VacationHours, 1
  FROM HumanResources.Employee AS e
  WHERE e.ManagerID = 12
  UNION ALL
  SELECT e.EmployeeID, e.VacationHours, EmployeeLevel + 1
  FROM HumanResources.Employee as e
  JOIN DirectReports AS d ON e.ManagerID = d.EmployeeID
)
UPDATE HumanResources.Employee
SET VacationHours = VacationHours * 1.25
FROM HumanResources.Employee AS e
JOIN DirectReports AS d ON e.EmployeeID = d.EmployeeID;

Yes, it should be. MSDN gives an example:

USE AdventureWorks;
GO
WITH DirectReports(EmployeeID, NewVacationHours, EmployeeLevel)
AS
(SELECT e.EmployeeID, e.VacationHours, 1
  FROM HumanResources.Employee AS e
  WHERE e.ManagerID = 12
  UNION ALL
  SELECT e.EmployeeID, e.VacationHours, EmployeeLevel + 1
  FROM HumanResources.Employee as e
  JOIN DirectReports AS d ON e.ManagerID = d.EmployeeID
)
UPDATE HumanResources.Employee
SET VacationHours = VacationHours * 1.25
FROM HumanResources.Employee AS e
JOIN DirectReports AS d ON e.EmployeeID = d.EmployeeID;

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