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Abstract. Query optimizers in object-relational database management systems require users to provide the execution cost models of user-defined functio

TomLane'sillustrationontrasationprocessinginpostgreSQL.

数据库领域关于“实视图”方面的论文汇编。是从事数据库研究、应用不可多得的资料。

非负矩阵分解，可用于文本的话题挖掘.Non-negative matrix factorization (NMF) has previously been shown to be a useful decomposition for multivariate data. Two different

离散数学中的主析取范式，及其应用！