family tree sql query

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

Latin Language

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DECLARE @FamilyTree TABLE(ID int, Name Varchar(50), MotherID int, FatherID int);
INSERT INTO @FamilyTree
(ID,  MotherID, FatherID,   Name) VALUES
(1,   NULL,    NULL,    'My Grand Father'),
(2,   NULL,    NULL,    'My Grand Mother'),
(3,   10, 9,  'My Mother'),
(4,   2,   1,   'My Father'),
(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 
      ft.*, 
      c.name as FatherName,  
      c2.name as MotherName, 
      0 AS Level
    FROM @FamilyTree ft
    INNER JOIN @FamilyTree c ON ft.FatherID = c.ID
    INNER JOIN @FamilyTree c2 ON ft.MotherID = c2.ID
    WHERE ft.ID = 5
    UNION ALL
    SELECT 
      f.ID, 
      f.Name AS ParentName, 
      f.MotherID, 
      f.FatherID, 
      c.Name AS FatherName, 
      c2.Name AS MotherName, 
      Level + 1
    FROM @FamilyTree AS f
    INNER JOIN FamilyCTE c ON F.FatherID = c.ID
    INNER JOIN @FamilyTree c2 ON f.MotherID = c2.ID
)

SELECT * FROM FamilyCTE;

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