XQuery的设计目标是从可能非常大的XML数据集中提取数据。
XQuery was designed for extracting data from potentially very large XML datasets.
像SQL一样，XQuery包含从多个数据集中提取数据、汇总数据、聚合数据和连接数据的函数。
Like SQL, XQuery contains functions for extracting, summarizing, aggregating, and joining data from multiple datasets.
数据通常存储在很多个不同的数据存储系统中，从所有源中提取数据并将其合并到单个一致的数据集中确实有一定的难度。
Data is typically stored in many different data storage systems, and extracting data from all sources and merging the data into a single, consistent dataset is challenging.
数据挖掘是从海量的复杂数据集中提取出有价值、有意义的知识。
Data mining has become focus for researchers, which is used to extract useful and meaningful knowledge from the vast amounts of complex data.
数据挖掘是从海量的复杂数据集中提取出有价值、有意义的知识。
Data mining has become focus for researchers, which is used to extract useful and meaningful knowledge from the vast amounts of complex data.
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