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CREATE FUNCTION f_Cid(@ID int) RETURNS @t_Level TABLE(ID int,Level int)
AS
BEGIN
DECLARE @Level int
SET @Level=1
INSERT @t_Level SELECT @ID,@Level
WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.ID,@Level
from tb a,@t_Level b
WHERE a.PID=b.ID
AND b.Level=@Level-1
END
RETURN
END
GO


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