文档介绍：Incremental Join of Time-Oriented Data Dieter Pfoser and Christian S. Jensen TR-34 AT IME C ENTER Technical Report Incremental Join of Time-Oriented Data Copyright c 1998 Dieter Pfoser and Christian S. Jensen. All rights re- served. Dieter Pfoser and Christian S. Jensen September 1998. A T IME C ENTER Technical Report. IME ENTER University, Denmark Christian S. Jensen (codirector), Michael H. B¨ ohlen, Renato Busatto, Curtis E. Dyreson, Heidi Gregersen, Dieter Pfoser, Simonas ˇSaltenis, Janne Skyt, Giedrius Slivinskas, Kristian Torp University of Arizona, USA Richard T. Snodgrass (codirector), Sudha Ram Individual participants Anindya Datta, ia Institute of Technology, USA Kwang W. Nam, Chungbuk National University, Korea Mario A. Nascimento, State University of Campinas and EMBRAPA, Brazil Keun H. Ryu, Chungbuk National University, Korea Michael D. Soo, University of South Florida, USA Andreas Steiner, TimeConsult, Switzerland Vassilis Tsotras, Polytechnic University, USA Jef Wijsen, Vrije Universiteit Brussel, Belgium For additional information, see The T IME C ENTER Homepage: URL: </research/DBS/tdb/TimeCenter/> Any software made available via T IME C ENTER is provided “as is” and without any express or implied war- ranties, including, without limitation, the implied warranty of merchantability and ?tness for a particular purpose. The T IME C ENTER icon on the bines two “arrows.” These “arrows” are letters in the so-called Rune alphabet used one millennium ago by the Vikings, as well as by their precedessors and essors. The Rune alphabet (second phase) has 16 letters, all of which have angular shapes and lack horizontal lines because the primary storage medium was wood. Runes may also be found on jewelry, tools, and weapons and were perceived by many as having magic, hidden powers. The two Rune arrows in the icon denote “T” and “C,” respectively. Abstract Data warehouses as well as a wide range of other databases exhibit a strong temporal orientation: it is impo