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From: "Catalin Pitis" <cata.pitis@gmail.com>
Newsgroups: comp.databases.oracle.server
Subject: Re: Flattening a time-based tree structure
Date: 8 Aug 2005 21:30:28 -0700
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Yes. For example, from 1/1/2003 to 31/12/2003 U1 is the parent of U2,
and from 1/1/2004 to 31/12/2004, U2 is the parent of U1.

Catalin