Family tree sql query

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http://stackoverflow.com/questions/13171931/family-tree-sql-query

Computational Science

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DECLARE @FamilyTree TABLE(BirimId int, BirimAd Varchar(50), ParentId int, RootId int);
INSERT INTO @FamilyTree
(BirimId,  ParentId, RootId,   BirimAd) VALUES
(1,   NULL,    NULL,    'İSTANBUL'),
(2,   NULL,    NULL,    'BOŞ'),
(3,   2, 1,  'İl Emniyet Müdürlüğü Polikliniği'),
(4,   2,   1,   'BOŞ'),
(5,   3,   4,   'Me'),
(6,   12, 11,  'My wife'),
(7,   3,   4,   'My Brother'),
(8,   6,   5,   'My son'),
(9,   NULL, NULL, 'My Mother Grand Father'),
(10, NULL, NULL, 'My Mother Grand Mother'),
(11, NULL, NULL, 'My Wife Grand Father'),
(12, NULL, NULL, 'My Wife Grand Mother');

;WITH FamilyCTE
AS
(
    SELECT 
      *, 
      CAST(NULL AS VARCHAR(50)) AS SUBE,
      CAST(NULL AS VARCHAR(50)) AS BURO, 1 AS Level
    FROM @FamilyTree
    WHERE RootId IS NULL
      AND BirimId = 1
    UNION ALL
    SELECT 
      f.BirimId, 
      f.BirimAd AS ParentName, 
      f.ParentId, 
      f.RootId, 
      c.BirimAd AS SUBE, 
      c2.BirimAd AS BURO, 
      Level + 1
    FROM @FamilyTree AS F
    INNER JOIN FamilyCTE c ON F.RootId = c.BirimId
    INNER JOIN @FamilyTree c2 ON f.ParentId = c2.BirimId
)

SELECT BirimId, ParentId, RootId, BirimAd,SUBE, BURO,Level 
FROM FamilyCTE

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