A query language for NC

A query language for NC
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NC 查询语言

DOI:
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发表时间:
1994
期刊:
Journal of computer and system sciences (Print)
影响因子:
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通讯作者:
V. Tannen
V. Tannen
中科院分区:
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文献类型:
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作者:
Dan Suciu;V. Tannen

文献摘要

被引文献

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我们表明,一种对集合的分治递归形式与关系代数一起,恰好能够表达在有序关系数据库上可在NC(并行计算复杂性类)中计算的查询。在更精细的层面上,我们将递归的k层嵌套使用恰好与ACk(k≥1,另一种并行计算复杂性类)相关联。我们还针对复杂对象给出了相应的结果。
We show that a form of divide and conquer recursion on sets together with the relational algebra expresses exactly the queries over ordered relational databases which are NC-computable. At a finer level, we relate k nested uses of recursion exactly to ACk, k≥1. We also give corresponding results for complex objects.