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SQL Server Recursive Fetch From Self Referencing Table

, 19 Nov 2009
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CREATE PROC GetChildNodes (@ID uniqueidentifier)ASBEGINWITH PermissionList (PermissionID, PermissionName, Level)AS(SELECT ap.PermissionID, ap.PermissionName, 0 AS LevelFROM Permission AS apWHERE PermissionID = @IDUNION ALLSELECT ap.PermissionID, ap.PermissionName, Level + 1FROM
CREATE PROC GetChildNodes (@ID uniqueidentifier)
AS
BEGIN
WITH PermissionList (PermissionID, PermissionName, Level)
AS
(
SELECT ap.PermissionID, ap.PermissionName, 0 AS Level
FROM Permission AS ap
WHERE PermissionID = @ID
UNION ALL
SELECT ap.PermissionID, ap.PermissionName, Level + 1
FROM Permission AS ap
INNER JOIN PermissionList AS pl
ON ap.ParentPermissionID = pl.PermissionID
) 

SELECT PermissionID, PermissionName, Level
FROM PermissionList 

END

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Anish M
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