The query processing in the distributed database systems is comprehensively summarized. This paper shows that using HASHING method for thereduction of semi-join communication cost is beneficial.

本文较全面地总结了分布式数据库系统的查询处理，并提出用HASHING 方法减少半连接通讯的开销是有利的。

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The method of distributed query optimization is analyzed deeply which use semi-join algorithm and query tree disassembling.

并用实例证明其相对于没有进行分布式查询优化的算法可以大大减少网络上传输的数据量。

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Lee had misgivings about leaving National Semi to join a 12-year-old private company still run by its founder.

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Lee had misgivings about leaving National Semi to join a 12-year-old company still run by its founder and still private.

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Zimbabwe now join Mozambique in the semi-finals with two more quarter-final matches still to be played.

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