1
binux 2014-03-17 12:27:33 +08:00
distinct?
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3
sun019 2014-03-17 13:05:13 +08:00
如果太为难sql 还是用程序吧
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4
xiaokai 2014-03-17 13:10:26 +08:00
可以用map reduce http://docs.mongodb.org/manual/core/map-reduce/
或者aggregate http://docs.mongodb.org/manual/aggregation |