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
Remove values from a matrix like document in MongoDB
To remove values from a matrix, use $pull in MongoDB. Let us create a collection with documents −
> db.demo632.insertOne(
... {
... "arrayMatrix": [
... [10,20],
... [10,20],
... [10,20],
... [10,20],
... [10,20],
... [10,20]
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e9b27b46c954c74be91e6c0")
}Display all documents from a collection with the help of find() method −
> db.demo632.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e9b27b46c954c74be91e6c0"),
"arrayMatrix" : [
[
10,
20
],
[
10,
20
],
[
10,
20
],
[
10,
20
],
[
10,
20
],
[
10,
20
]
]
}Following is the query to remove values from a matrix like document in MongoDB −
> db.demo632.update(
... {},
... {
... "$pull": {
... "arrayMatrix.0": 20,
... "arrayMatrix.1": 20,
... "arrayMatrix.2": 20,
... "arrayMatrix.3": 20,
... "arrayMatrix.4": 20,
... "arrayMatrix.5": 20
... }
... }
... )
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo632.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e9b27b46c954c74be91e6c0"),
"arrayMatrix" : [
[
10
],
[
10
],
[
10
],
[
10
],
[
10
],
[
10
]
]
}
Updated on: 12-May-2020
80 Views
Advertisements