START WITH en Oracle y WITH en SQL

En Oracle existe la setencia START WITH and CONNECT BY, de manera que se puede hacer

SELECT child, parent, level
FROM  Prueba
START WITH parent is null
  CONNECTED BY PRIOR child = parent;
En SQL como sintaxis equivalente tenemos:
WITH Empleados (EmployeeID, ManagerID, Level)
AS
 (
 SELECT EmployeeID, ManagerID, 1
 FROM HumanResources.Employee
 WHERE ManagerID IS NULL
 UNION ALL
 SELECT Employee.EmployeeID, Employee.ManagerID, Empleados.Level+1
 FROM HumanResources.Employee
 JOIN Empleados
 ON Empleados.EmployeeID=Employee.ManagerID
 )
SELECT * FROM Empleados