Created
September 11, 2014 06:02
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hw5.2
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| db.grades.aggregate([{$group:{"_id": {state: "$state", city: "$city"}, pop: {"$sum": "$pop"}}}, {$match:{"pop":{"$gt":25000}, "_id.state": {"$in": ["CA", "NY"]}}}, {$group:{"_id":null,avg: {"$avg": "$pop"}}} ]) |
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