How to group by in mongodb query?
How to group by in mongodb query?
1 answer
by
raven_corwin ,
10 months ago
@filiberto You can use the MongoDB $group aggregation operator to group documents from a collection by a specified expression or id:
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db.yourCollection.aggregate([ { "$group": { "_id": { key: "$someValue" }, "total": { "$sum": "$someValue" } } } ]) |