Reterive child parent records from Sql Database.

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Hello Every One,

I am working in a asp.Net project in which i am using Sql server 2008.
I have a table "table1".
table name : table1
columns:

empId(Int) empname(varchar)     parentid(int)
1           raj kumar            -1
2           sunil rawat           1 
3           prem kumar            1
4           sunny sohni           2
5           laura dutta           3
6           honey                 3

above is my table. now i want a record of those employee whose parent id is 1.
but i also want that if child of 1 empid like 3 has also child then it should be retrieve. any one know what sql query will be use for this.

please help me..

Posted 22-May-12 18:39pm

coolnavjot31

Updated 22-May-12 18:45pm

Wendelius

v2

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Nilesh Patil Kolhapur 23-May-12 0:45am

not clear improve question

1 solution

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Wendelius · Answer 1 · 2012-05-22T18:44:00

Solution 1

This depends on how you want to have your data. But for example if you need parent and child on the same row, you could try something like

SQL

SELECT t1.EmpId, t1.EmpName, t2.EmpId, t2.EmpName
FROM table1 t1 left outer join table2 t2
     on t1.EmpId = t2.ParentId

Addition, recursive example

SQL

WITH Employees(ParentId, EmpID, EmpName, Level) AS (
    SELECT t1.ParentId, t1.EmpID, t1.EmpName, 0 AS Level
    FROM table1 t1
    WHERE ParentId = -1
    UNION ALL
    SELECT t2.ParentId, t2.EmpID, t2.EmpName, Level + 1
    FROM table1 t2 inner join Employees e
        ON e.EmpId = t2.ParentId
)
SELECT ParentId, EmpID, EmpName, Level
FROM Employees

Posted 22-May-12 18:44pm

Wendelius

Updated 22-May-12 19:17pm

v2

Comments

coolnavjot31 23-May-12 1:09am

Hello Mika,

thanks for your reply.
please tell me if i would like to retrieve all child records of empID = 1
and sub child of empid=1's child records.

please help me.

Wendelius 23-May-12 1:17am

Then you would need a recursive query, please see the updated answer.

coolnavjot31 23-May-12 2:08am

thanks Mika for your help.

coolnavjot31 23-May-12 2:09am

i find a complete solution from following link:
http://blog.mclaughlinsoftware.com/2009/04/03/t-sql-hierarchical-query/

Wendelius 23-May-12 2:14am

Looks like a good link :)

Maciej Los 23-May-12 12:30pm

So... Copy the body of this comment as answer and accept it. Formally accept the answer of Mika and rate it.

Wendelius 23-May-12 2:13am

You're welcome!