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docs/en/guides/54-query/00-cte.md

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@@ -294,31 +294,29 @@ Now, we use a recursive CTE to find the hierarchy of employees under a specific
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```sql
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WITH RECURSIVE EmployeeHierarchy AS (
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-- Start with Alice (the CEO)
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SELECT EmployeeID, EmployeeName, ManagerID
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SELECT EmployeeID, EmployeeName, managerid, EmployeeName as LeaderName
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FROM Employees
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WHERE ManagerID IS NULL
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WHERE EmployeeID=1
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UNION ALL
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-- Recursively find employees reporting to the current level
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SELECT e.EmployeeID, e.EmployeeName, e.ManagerID
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SELECT e.EmployeeID, e.EmployeeName, e.managerid, eh.EmployeeName
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FROM Employees e
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JOIN EmployeeHierarchy eh2 ON e.ManagerID = eh2.EmployeeID
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JOIN EmployeeHierarchy eh ON e.ManagerID = eh.EmployeeID
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)
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SELECT eh.EmployeeID, eh.EmployeeName, m.EmployeeName AS ManagerName
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FROM EmployeeHierarchy eh
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JOIN Employees m ON eh.ManagerID = m.EmployeeID
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ORDER BY eh.EmployeeID;
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SELECT * FROM EmployeeHierarchy;
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```
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The output will list all employees in the hierarchy under Alice:
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```sql
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┌───────────────────────────────────────────────────────┐
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│ employeeid │ employeename │ managername │
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├─────────────────┼──────────────────┼──────────────────┤
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2 │ Bob │ Alice │
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3 │ Charlie │ Alice │
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4 │ David │ Bob │
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5 │ Eve │ Bob │
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6 │ Frank │ Charlie │
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└───────────────────────────────────────────────────────┘
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┌─────────────────────────────────────────────────────────────────────────┐
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│ employeeid │ employeename │ managerid │ leadername │
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├─────────────────┼──────────────────┼─────────────────┼──────────────────┤
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1 │ Alice │ NULL │ Alice │
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2 │ Bob │ 1 │ Alice │
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3 │ Charlie │ 1 │ Alice │
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4 │ David │ 2 │ Bob │
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5 │ Eve │ 2 │ Bob │
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6 │ Frank │ 3 │ Charlie │
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└─────────────────────────────────────────────────────────────────────────┘
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```

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