How to Implement a Hierarchy using SQL Server?

Hierarchy can be implemented using common table expression (CTE).

WITH UserHierarchy ([user_id], [manager_id],[Level]) AS

(

SELECT [user_id],user_ap_mngd_by as manager,0

FROM [user_profile] usrtmp1

WHERE usrtmp1.[user_id]=1

UNION ALL

SELECT usrtmp2.[user_id],user_ap_mngd_by as manager, [Level] + 1

FROM [user_profile] usrtmp2

INNER JOIN UserHierarchy ON

usrtmp2.user_ap_mngd_by = UserHierarchy.[user_id]

)

SELECT * FROM UserHierarchy



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