家谱树sql查询

Question

我正在使用sql server2008在asp.net中开发家谱应用程序。

我的主表是这样的：

ID int PK
Name Varchar(50)
MotherID int
FatherID int

ID  MotherID FatherID   Name

1   NULL    NULL    My Grand Father

2   NULL    NULL    My Grand Mother

3   someid  someid  My Mother

4   2   1   My Father

5   3   4   Me

6   someid  someid  My wife

7   3   4   My Brother

8   6   5   My son.

我正在寻找这样的输出

ID  MotherID    FatherID    Name        Level

1   someid  someid  grandfather 0


2   someid  someid  Father      1

3   someid  someid  Me      2


4   someid  someid  Brother     2

5   someid  someid  My Son      3

提前谢谢。克什米尔。

Answer 1

试试这个：

;WITH FamilyCTE
AS
(
    SELECT 
      *, 
      CAST(NULL AS VARCHAR(50)) AS FatherName,  
      CAST(NULL AS VARCHAR(50)) AS MotherName, 0 AS Level
    FROM @FamilyTree
    WHERE FatherID IS NULL 
      AND MotherID IS NULL
    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

Demo

如果想要得到像你在问题中发布的那样的精确输出，只需忽略FatherName和MotherName，并将SELECT * FROM FamilyCTE中的选择限制为您想要选择的列，例如，在锚点查询中使用WHERE ID = 1的起始祖父。如下demo所示：

DEMO

Answer 2

select t1.ID, t1.MotherID, 
t1.FatherID,
t1.name, 
t2.Name,
Level
from table1 t1
left outer join table2 t2 on t1.FatherID =t2.FatherID