怎么用sqlserver实现递归删除目录结构
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发布时间：2022-04-08 08:42
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时间：2022-04-08 10:11
WITH DirectReports(ManagerID, EmployeeID, Title, EmployeeLevel) AS ( SELECT ManagerID, EmployeeID, Title, 0 AS EmployeeLevel FROM dbo.MyEmployees WHERE ManagerID IS NULL UNION ALL --主要是在此，增加一个union all SELECT e.ManagerID, e.EmployeeID, e.Title, EmployeeLevel + 1 FROM dbo.MyEmployees AS e INNER JOIN DirectReports AS d -- 在此调用自身，就可以实现递归了 ON e.ManagerID = d.EmployeeID ) SELECT ManagerID, EmployeeID, Title, EmployeeLevel FROM DirectReports ORDER BY ManagerID;
