SQL Query for fetching Hierarchical value from Parent Child Relationship

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SQL-Server-2008R2

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Hi Frnds,

I have a table with multiple Hierarchy as child relationship.

For eg .:

SQL

ParentId   ChildID

    1             11
    11            21
    21            31
    31            41
    41            51
    51            61
    61            71

I need output as per ChildId and level of Hierarchy...
For example if i pass values in query as ChildId=61 and Hierachy =2

Output Should be

SQL

ParentId    ChildId

   31           41

For example if i pass values in query as ChildId=61 and Hierachy =3

Output Should be

SQL

ParentId    ChildId

  21           31

I tried different ways , but i ddnt get solution.Help me for get solution.

Thanks
Suresh

Posted 7-Sep-14 22:56pm

itsureshuk

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_Asif_ · Accepted Answer · 2014-09-08T00:27:00

Tough i am not happy with below solution but this could get you going.

SQL

DECLARE @TBL TABLE
(
	PARENTID INT,
	CHILDID INT
)

DECLARE @TAGERTTBL TABLE
(
	PARENTID INT,
	CHILDID INT,
	Level int IDENTITY(0, 1)
)

INSERT INTO @TBL(PARENTID, CHILDID)
SELECT    1,			 11	UNION ALL
SELECT    11,            21 UNION ALL
SELECT    21,            31 UNION ALL
SELECT    31,            41 UNION ALL
SELECT    41,            51 UNION ALL
SELECT    51,            61 UNION ALL
SELECT    61,            71;

with TMPH(ParentId, ChildID, Level)
AS (
	SELECT ParentID, CHildID, 0 AS level
	FROM   @TBL
	WHERE  PARENTID = 61
	UNION ALL
	SELECT T.ParentId, T.ChildID, Level + 1
	FROM TMPH TM 
	INNER JOIN @TBL T ON TM.ParentId = T.ChildID 
)
INSERT INTO @TAGERTTBL(PARENTID, CHILDID)
SELECT PARENTID, CHILDID FROM TMPH
order by Level desc

SELECT * 
FROM @TAGERTTBL
where Level in (2,3 )