New answer using Mongo aggregation framework. After this question was asked and answered, 10gen released Mongodb version 2.2 with an ... ... <看更多>

db.journals.aggregate(. [. {. $group : {. _id : { month: { $month: "$date" }, day: { $dayOfMonth: "$date" }, year: { $year: "$date" } },. count: { $sum: 1 }. }. ... <看更多>

Efficient way to get data for each date range intervals using single query | MongoDB · mongodb group-by aggregate nosql. I have collections ... ... <看更多>

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