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Need to aggregate by hour and $avg in MongoDB
To aggregate, use aggregate() in MongoDB. It calculates aggregate values for the data in a collection.
Let us create a collection with documents −
> db.demo544.insertOne({"DueTime":new ISODate("2020-01-10 12:10:20"),Amount:100});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8e1f029e5f92834d7f05ce")
}
> db.demo544.insertOne({"DueTime":new ISODate("2020-01-12 12:00:00"),Amount:500});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8e1f089e5f92834d7f05cf")
}
> db.demo544.insertOne({"DueTime":new ISODate("2020-01-12 12:10:20"),Amount:900});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8e1f109e5f92834d7f05d0")
}Display all documents from a collection with the help of find() method −
> db.demo544.find();
This will produce the following output −
{ "_id" : ObjectId("5e8e1f029e5f92834d7f05ce"), "DueTime" : ISODate("2020-01-10T12:10:20Z"), "Amount" : 100 }
{ "_id" : ObjectId("5e8e1f089e5f92834d7f05cf"), "DueTime" : ISODate("2020-01-12T12:00:00Z"), "Amount" : 500 }
{ "_id" : ObjectId("5e8e1f109e5f92834d7f05d0"), "DueTime" : ISODate("2020-01-12T12:10:20Z"), "Amount" : 900 }Following is the query to aggregate by an hour and $avg −
> db.demo544.aggregate( { "$group": { "_id": { "$hour": "$dueTime" }, "Amount": { "$avg": "$Amount" } }} )This will produce the following output −
{ "_id" : null, "Amount" : 500 }
Updated on: 14-May-2020
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