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microsoft, sql, server, 2000 database ,get top parent in query

Posted on 2007-11-28
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Last Modified: 2008-02-01
folks

i have a parent child relationship in sql server

  child   parent
  aaa      aa
  aa        a
   a          

how if I select child aaa can I display a as its top parent i.e

child    top parent
aaa        a

all help will do,i use the connect by prior in oracle but havent found anyhting decent in sql
       
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Question by:rutgermons
6 Comments
 
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Expert Comment

by:spprivate
ID: 20368542
This is a solution to another question in the same lines
create table #a (id int)

insert #a select @bossID
 

while @@rowcount > 0

insert #a 

select empoloyeeID

from people, #a

where #a.id = people.bossID

and not exists (select * from #a a2 where a2.id = people.employeeID)
 

select * from #a

Open in new window

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Expert Comment

by:spprivate
ID: 20368551
Create an stored procedure. with the above code
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Author Comment

by:rutgermons
ID: 20368558
could yoou post me the entire link pls?
0
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Expert Comment

by:spprivate
ID: 20368606
0
 
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Accepted Solution

by:
Scott Pletcher earned 500 total points
ID: 20369698
Instead use a function so that you can call it in-line as part of a SELECT; for example:

CREATE FUNCTION dbo.GetTopParent (
    @child VARCHAR(10)
)
RETURNS VARCHAR(10)
AS
BEGIN
DECLARE @parent VARCHAR(10)

WHILE 1 = 1
BEGIN
    SELECT @parent = parent
    FROM tableName
    WHERE child = @child
    IF ISNULL(@parent, '') = ''
        BREAK
    SET @child = @parent
END --WHILE

RETURN @child
END --FUNCTION


SELECT child, dbo.GetTopParent(child) AS TopParent
FROM tableName
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Expert Comment

by:_agx_
ID: 20370497
(No points)

Whatever method you choose,  be certain it prevents infinite loops from occurring.  For example if an error in your data created an unintentional circular reference like this

child, parent
'aaaa', 'aaa'
'aaa', 'aa'   <--- circular reference
'aa', 'aaa'   <--- circular reference
'a', NULL

It could cause an infinite loop here

WHILE 1 = 1
BEGIN
    SELECT @parent = parent
    FROM tableName
    WHERE child = @child
    IF ISNULL(@parent, '') = ''
        BREAK
    SET @child = @parent
END --WHILE
0

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