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A column-oriented database is a new database concept that stores tables in column order instead of tuple order. It is known to better handle large data than traditional row(tuple)-oriented databases. In recent years, commercial column-oriented DBMSs, such as Sybase IQ, are widely used in data warehouse applications. In this paper we propose a join technique to improve the performance of star schema queries in column-oriented databases. Our technique uses a join mapping tree structure thatfatcat:m5qljbawdbdjxaniujoiscemv4