I want the result from your query to be:
ID Level Path
A 1 A
B 2 A.B
C 2 A.C
D 3 A.B.D
E 3 A.B.C
CREATE TABLE #x ( ID CHAR(1), ParentID CHAR(1) ) INSERT #x (ID, ParentID) SELECT 'A', NULL UNION ALL SELECT 'B', 'A' UNION ALL SELECT 'C', 'A' UNION ALL SELECT 'D', 'B' UNION ALL SELECT 'E', 'C' ;WITH FullPath AS ( SELECT ID, 1 AS Level, CONVERT(VARCHAR(MAX), ID) AS Path FROM #x WHERE ParentID IS NULL UNION ALL SELECT x.ID, FP.Level + 1 AS Level, FP.Path + '.' + x.ID AS Path FROM #x AS x JOIN FullPath FP ON x.ParentID = FP.ID ) SELECT * FROM FullPath
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