Help with Delete Procedure

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SQL-Server-2005

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Well, If I have this datas in table

Table:
ID --- ParentID
1 ---- null
2 ----- 1
3 ----- 2
4 ----- 2
5 ----- null

If I delete ID=1, I want to delete everything that binded with this ID
in this example I want to delete everything except ID=5
How can I do it?

In this case, It is not working

SQL

IF (EXISTS(SELECT * FROM dbo.Table_1 WHERE @ID=ParentID))
     DELETE FROM dbo.Table_1 where ID=@ID OR ParentID=@ID
ELSE
     DELETE FROM dbo.Table_1 where ID=@ID

Posted 19-Dec-10 6:56am

Sider89

Updated 19-Dec-10 8:10am

HimanshuJoshi

v2

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2 solutions

Solution 1

I believe you are somewhat confused. Given an ID = 1 you will only be able to delete the record with ID = 2 since it is the only one with a direct link to the parent in question.

You could restructure your tables to have parent and child tables and use ON DELETE CASCADE

Otherwise you are going to need some recursive query to find all related child, grandchildren, great-grandchildren, etc.

Posted 19-Dec-10 8:46am

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Avachat Nikhil · Accepted Answer · 2010-12-29T01:26:00

Hi Sider89,
Try this code. it works.

SQL

With Family As
(
    Select s.ID as aid, null as parentid,s.ID as mainparentid,  0 as Depth
    From tree s Where ID = 1
    Union All
    Select s2.ID, s2.ParentId,mainparentid, Depth + 1
    From tree s2
    Join Family
    On Family.aID = s2.ParentId  )
delete t From Family f join tree t on f.aid=t.id