Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to calculate sum in MongoDB with aggregate()?
To get the sum, use $sum along with aggregate(). Let us create a collection with documents −
> db.demo337.insertOne({"Amount":100});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e5231e5f8647eb59e56209b")
}
> db.demo337.insertOne({"Amount":500});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e5231e9f8647eb59e56209c")
}
> db.demo337.insertOne({"Amount":400});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e5231ebf8647eb59e56209d")
}Display all documents from a collection with the help of find() method −
> db.demo337.find();
This will produce the following output −
{ "_id" : ObjectId("5e5231e5f8647eb59e56209b"), "Amount" : 100 }
{ "_id" : ObjectId("5e5231e9f8647eb59e56209c"), "Amount" : 500 }
{ "_id" : ObjectId("5e5231ebf8647eb59e56209d"), "Amount" : 400 }Following is the query to calculate sum in MongoDB −
> db.demo337.aggregate(
... [
... {
... $group:
... {
... _id:null,
... totalAmount: { $sum:"$Amount" }
... }
... }
... ]
... );This will produce the following output −
{ "_id" : null, "totalAmount" : 1000 }
Updated on: 02-Apr-2020
2K+ Views
Advertisements