multi join query 多元连接查询
The experiments prove that th~ rewriter rules are effective and genetc algorithm has obvious advantage while processing multi-join query.
结果表明，本文提出的重写规则是很有效的，遗传算法在处理多连接查询时具有明显的优越性。
参考来源 - 关系数据库查询优化技术的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Multi-Join Query Optimization;
多连接查询优化；
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
多连接查询优化是并行数据库系统的核心问题。
Now most of the research work is based on the storage of single relation, and could not support effectively complex multi-join query.
已有的研究工作多集中在基于单个关系的存储分布，不能有效支持复杂多连接查询处理。
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