cte递归

-- 不解释。。
WITH     SimpleRecursive ( Employee_NM, Employee_ID, ReportsTo ,Sublevel)
           AS  (  SELECT    Employee_NM ,
                        Employee_ID ,
                        ReportsTo,
                         0
                FROM      Employee_Tree
                WHERE     Employee_ID  =   2
                UNION   ALL
                SELECT    p.Employee_NM ,
                        p.Employee_ID ,
                        p.ReportsTo,
                        Sublevel  +   1
                FROM      Employee_Tree p
                         INNER   JOIN  SimpleRecursive A  ON  A.Employee_ID  =  p.ReportsTo
             )
     SELECT   sr.Employee_ID  AS  empid ,
            sr.Employee_NM  AS  Emp ,
            et.Employee_NM  AS  Boss      
     FROM     SimpleRecursive sr
             INNER   JOIN  Employee_Tree et  ON  sr.ReportsTo  =  et.Employee_ID
             WHERE     Sublevel  <= 2