迁移到MongoDB：如何查询GROUP BY + WHERe

迁移到MongoDB：如何查询GROUP BY + WHERe

在整个文档，Google和此站点中都有一些示例。

一些参考：

• http://api.mongodb.org/python/current/examples/aggregation.html
• http://docs.mongodb.org/manual/reference/aggregation/group/
• http://docs.mongodb.org/manual/reference/aggregation/sum/

对于一些代码：

self.db.aggregate(    # Lets find our records    {"$match":{"Time":{"$gte":100,"$lte":1000}}},    # Now lets group on the name counting how many grouped documents we have    {"$group":{"_id":"$name", "sum":{"$sum":1}}} )