how to find previous & forward relation of data in single query.

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SQL

SQL-Server

Oracle

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I have table :

C#

ID      Person_ID        Person_Relative_ID
 1         10                   20
 2         20                   30
 3         13                   15
 4         30                   40 
 5         55                   56
 6         40                   50

Here we can see the person & person_relative_id chain is going like 10 - 20 - 30 - 40 - 50

Now if user search Person_Relative_ID of person_id = 20 then result would be like: [All its relation]

C#

Person_Relative_ID
             10
             30
             40
             50

Or user want to search Person_Relative_ID for person_id = 40 . then result like

C#

Person_Relative_ID
            10
            20
            30
            50

Or user want to search Person_Relative_ID for person_id = 50 . then result like

C#

Person_Relative_ID
             10
             20
             30
             40

Any suggestion really appreciated!

Posted 19-May-14 20:26pm

Mas11

Updated 19-May-14 21:09pm

v3

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Mycroft Holmes 20-May-14 3:40am

In SQL Server you have "Common Table Expressions" CTE which allows you to create a recursive query

2 solutions

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Maciej Los · Answer 1 · 2014-05-20T07:14:00

Solution 1

Have a look here: SQL Wizardry Part Three - Common Table Expressions (CTEs)[^]. There you'll find a sample query to get hierarchical data.

Posted 20-May-14 7:14am

Maciej Los

Comments

Mas11 21-May-14 2:38am

thx a lot for your suggestion,

soumyajayaraj · Answer 2 · 2014-05-20T22:15:00

Try this

SQL

DECLARE @PersonId INT =10;
WITH ForwardRelationsCTE AS(
    SELECT Person_ID, Person_Relative_ID FROM dbo.Relations_Table WHERE Person_ID = @PersonId
    UNION ALL
    SELECT t1.Person_ID  , t1.Person_Relative_ID FROM dbo.Relations_Table AS t1
    JOIN ForwardRelationsCTE AS cte
    ON t1.Person_ID = cte.Person_Relative_ID

),
BackwardRelationsCTE AS(
    SELECT Person_ID, Person_Relative_ID FROM dbo.Relations_Table WHERE Person_Relative_ID = @PersonId
    UNION ALL
    SELECT t1.Person_ID  , t1.Person_Relative_ID FROM dbo.Relations_Table AS t1 JOIN BackwardRelationsCTE AS cte
    ON t1.Person_Relative_ID = cte.Person_ID
)
SELECT Person_ID FROM BackwardRelationsCTE WHERE Person_ID <> @PersonId
UNION
SELECT Person_ID FROM ForwardRelationsCTE WHERE Person_ID <> @PersonId
UNION
SELECT  A.Person_Relative_ID FROM ForwardRelationsCTE AS A
LEFT OUTER JOIN Relations_Table AS B ON A.Person_Relative_ID=B.Person_ID Where B.Person_ID IS NULL

The last union query is to include the last node like person 50 in your example.