Sorting is required when no index satisfies the requested ordering of fetched rows, or the optimizer determines that a sort is less expensive than an index scan.
如果没有索引满足所取的行的要求顺序，或者优化器断定排序的代价低于索引扫描，那么就需要进行排序。
Lists topics on creating, modifying, running, and copying queries as well as basic topics on sorting, ordering, and printing query results.
列出关于创建、修改、运行和复制查询的主题以及关于将查询结果排序和打印的基本主题。
Sorting and classifying are two basic kinds of knowledge and mining ordering rules is a novel thought. The algorithms for ordering rules is discussed deeply and improved in this paper.
排序和分类是人类的两种基本知识，一般文献中讨论的都是关于分类规则的挖掘，挖掘排序规则是一种新的思想，本文对挖掘排序规则的算法作了更为全面深入的探讨并加以改进。
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