sql-server-2008 - 删除所有具有父 ID 的递归子 ID

Question

ManagerID EmployeeID Title                         Level
--------- ---------- ----------------------------- ------
NULL      1          Chief Executive Officer       0
1         273        Vice President of Sales       1
273       16         Marketing Manager             2
273       274        North American Sales Manager  2
273       285        Pacific Sales Manager         2
16        23         Marketing Specialist          3
274       275        Sales Representative          3
274       276        Sales Representative          3
285       286        Sales Representative          3

我想要一个递归删除与employeeID 和managerID 匹配的数据的查询。

例如，当我删除值为 1 的员工 ID 时，它应该删除 1 的 managerID 并再次递归检查 managerID 1 = 273 EmployeeID 并比较该 273 ManagerID 并找出 16 的员工 ID 等等。

假设我们递归地删除子 id 与 parentid 相比，就像在购物车中一样，当我们删除父类别时，它会递归地删除所有产品及其子产品。

Answer 1

你可以尝试类似的东西

DECLARE @EmployeeID INT = 1
;WITH Vals AS (
  SELECT *
  FROM Table1
  WHERE EmployeeID = @EmployeeID
  UNION ALL
  SELECT t1.*
  FROM Table1 t1 INNER JOIN
  Vals v ON t1.ManagerID = v.EmployeeID
 )
DELETE
FROM Table1
WHERE EmployeeID IN (SELECT EmployeeID FROM Vals)

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