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mongodb aggregate over nested fields

Super Sandpiper on Oct 22, 2020

> db.demo99.aggregate([ { $project: { Count: { $objectToArray: "$Details" } } }, { $unwind: "$Count" }, { $group: { _id: "$Count.k", count: { $sum: "$Count.v.Number"} } } ])

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"mongodb aggregate over nested fields" Code Answer's