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 get the intersection of two arrays in MongoDB?
To get intersection of two arrays, use $setIntersection along with aggregate(). Let us create a collection with documents −
> db.demo61.insertOne({"Values1":[10,20,30,40,50],"Values2":[30,100,70,120,40]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e286e28cfb11e5c34d8992a")
}Display all documents from a collection with the help of find() method −
> db.demo61.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e286e28cfb11e5c34d8992a"),
"Values1" : [
10,
20,
30,
40,
50
],
"Values2" : [
30,
100,
70,
120,
40
]
}Following is the query to get the intersection of two arrays in MongoDB −
> db.demo61.aggregate(
... [
... { $project: { BothValues:{ $setIntersection: [ "$Values1", "$Values2" ] }} }
... ]
... );This will produce the following output −
{ "_id" : ObjectId("5e286e28cfb11e5c34d8992a"), "BothValues" : [ 30, 40 ] }
Updated on: 03-Apr-2020
544 Views
Advertisements