MongoDb sum query
For example I have the following data in MongoDB:
{ "_id" : ObjectId("524091f99c49c4c3f66b0e46"), "hour" : 10, "incoming", 100}
{ "_id" : ObjectId("5240a045dbeff33c7333aa51"), "hour" : 11, "incoming", 200}
{ "_id" : ObjectId("5240a2ecda0d37f35c618aca"), "hour" : 12, "incoming", 300}
Now I want to query "SUM the number of incoming between 11 - 12" (the result should be 500), how could I do this using Mongo Shell?
Solution 1:
As llovet suggested, the aggregation framework is the way to go. Here's what your query would look like:
db.CollectionNameGoesHere.aggregate({ $match: {
$and: [
{ hour: { $gte: 11 } },
{ hour: { $lte: 12 } }
]
} },
{ $group: { _id : null, sum : { $sum: "$incoming" } } });
You can also shape the resulting document to only contain the sum by adding a $project operator at the end of the pipeline, like so:
{ $project: { _id: 0, sum: 1 } }
Solution 2:
Some examples if you use mongoose:
- Calculate total sum of product prices :
Products.aggregate([ { $match: {} }, { $group:
{ _id : null, sum : { $sum: "$Price" } }
}])
.then(res => console.log(res[0].sum));
( { $match: {} },
can be removed. )
- Sum of Product's prices in each category:
Products.aggregate([{ $group:
{ _id : '$Category', sum : { $sum: "$Price" } }
}])
.then(res => console.log(res));