中文模板 Key words: ontology; query division; query equivalence; heterogeneous information integration [gap=193]关键词 : 本体;查询划分;查询等价;异构信息集成
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证明了关于查询等价和有限步数引理，讨论了不同条件下信息检索算法的复杂度，并在试验中验证了信息动态路由算法的可行性和高效率。
The lemma of query equivalent and lemma of limited steps was proved and the complexity of information query algorithm in different conditions was discussed.
您始终可以将嵌套查询转换成等价的连接。
You can always convert a nested query into an equivalent join.
根据这些算法和关系代数等价定理，给出了对关系代数查询树进行逻辑优化的规则，并证明了逻辑优化的正确性。
With these algorithms and the equivalence theory, the several rules to logically optimize the accessing trees were presented and the correctness for the logical optimization was proved.
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