WITH EMPLVL AS (

--anchor

SELECT E.Employee_id, E.Employee_name, E.Manager_id, E.Manager_name , 0 AS Employee_level

,[Path_id] = CAST(E.Employee_id AS NVARCHAR(MAX))

,[Path_name] = CAST(E.Employee_name AS NVARCHAR(MAX))

FROM EMPLOYEE E

WHERE E.Manager_id IS NULL

​

UNION ALL 

--Recursive

SELECT E.Employee_id, E.Employee_name, E.Manager_id, E.Manager_name , L.Employee_level + 1 as Employee_level

,[Path_id] = CONCAT(CAST([Path_id] AS NVARCHAR(MAX)),  N' / ', CAST(E.Employee_id AS NVARCHAR(MAX)))

,[Path_name] = CONCAT(CAST([Path_name] AS NVARCHAR(MAX)),  N' / ', CAST(E.Employee_name AS NVARCHAR(MAX)))

FROM EMPLOYEE E

INNER JOIN EMPLVL L ON E.Manager_id = L.Employee_id

)

​

SELECT * FROM EMPLVL

ORDER BY Employee_level