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Re: Traversing subtrees [message #3643 is a reply to message #3639]

Fri, 05 April 2013 12:28

AJM
Messages: 2397
Registered: April 2006
Location: Surrey, UK

Senior Member

Why do you think that a record with a null parent_id is not normalised? It signifies that a node does not have a parent, which either means that it is at the top of the tree, or it has been orphaned (ie: waiting to be assigned to a parent).

My tree structure is not supposed to be the only way to represent a tree, it just happens to be the one that suited my purposes many years ago when a particular requirement arose. There may be other ways to handle tree structures, so you are free to implement whatever takes your fancy.

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

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[Message index]

		Traversing subtrees By: DannyBoyPoker on Fri, 05 April 2013 10:49
		Re: Traversing subtrees By: AJM on Fri, 05 April 2013 12:28
		Re: Traversing subtrees By: DannyBoyPoker on Fri, 05 April 2013 21:22
		Re: Traversing subtrees By: AJM on Sat, 06 April 2013 06:32
		Re: Traversing subtrees By: DannyBoyPoker on Sat, 06 April 2013 07:02
		Re: Traversing subtrees By: AJM on Sat, 06 April 2013 09:39
		Re: Traversing subtrees By: DannyBoyPoker on Sat, 06 April 2013 07:42
		Re: Traversing subtrees By: AJM on Sat, 06 April 2013 09:44
		Re: Traversing subtrees By: DannyBoyPoker on Sat, 06 April 2013 09:14
		Re: Traversing subtrees By: AJM on Sat, 06 April 2013 09:50

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