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How to implement this kind of sorting?

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  #1  
Old July 15th, 2004, 01:18 PM
sn1p3t sn1p3t is offline
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How to implement this kind of sorting?
Here's a basic overview of my Table

ID identity int
ParentID int
Name varchar

Now, the root level items will have a ParentID of NULL, and the child nodes will have it's parent's ID in it's ParentID column (a simple self-referencing relationship).

However, when I select it, I would like to Order by ID, but then have all it's children right after it. For example, if this is the unsorted view:
Code:
ID     ParentID     Name
----------------------
1      <NULL>      Test
2     1               Test Child 1
3     <NULL>       Test 2
4     1                Test Child 2
5     3                 Test 2 Child 1

I would like the sorted to look like:
Code:
ID     ParentID     Name
----------------------
1      <NULL>      Test
2     1               Test Child 1
4     1                Test Child 2
3     <NULL>       Test 2
5     3                 Test 2 Child 1

Is this possible with my current structure? If not, how could I change it?
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  #2  
Old July 15th, 2004, 01:32 PM
Username=NULL Username=NULL is offline
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give this a shot...simple order by should take care of this.
Code:
select	* from myTable
where	ParentID is not null
order 	by ParentID, name

...note, the where clause is included so that you don't get all the parent records back, just take it out if you wanna see 'em.
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  #3  
Old July 15th, 2004, 01:34 PM
Username=NULL Username=NULL is offline
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Oh wait...you do want the NULL parentID's...sorry, my solution won't give you what you want...
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  #4  
Old July 15th, 2004, 01:37 PM
sn1p3t sn1p3t is offline
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Figured it out:

Code:
SELECT ...
FROM ...
WHERE ...
ORDER BY COALESCE (ParentID, ID), ID


Easy when you use math
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  #5  
Old July 15th, 2004, 01:51 PM
sn1p3t sn1p3t is offline
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Except if I wanted this to go down more than one level... still working on that
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