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如何在MongoDB上使用MapReduce,重构一张表的结构,将原表的数据复制到新表中?或任何实现这一目标的方法。
谢谢。
你可以在这里阅读它
http://docs.mongodb.org/manual/core/map-reduce/
特别是
http://docs.mongodb.org/manual/tutorial/map-reduce-examples/