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In any database, we need to organize the data in a way that we can easily find that data when necessary. To do this, it is very important to create a unique identity. In MongoDB, there is a built-in unique identification system using a fiel...

$in Operator searches within an array that you provide. For example, if you are given an array and want to search for one or more matching elements in a MongoDB collection, you can use $in . Use $in the operator to search for a specified ar...

Today, we will learn how to project nested fields when querying data in MongoDB using the $project and $unset aggregation stages, forEach() loops, and methods. mapReduce() MongoDB item nested fields In MongoDB, we can find() retrieve all do...

This article is a step-by-step installation and configuration guide for Elasticsearch on Windows and Ubuntu 20.04. It also demonstrates using Elasticsearch with MongoDB on both operating systems. What is Elasticsearch Elasticsearch is a NoS...

Today, we will merge two collections into one using $lookup the Aggregate stage, the pipeline AND $unwind operator, the Filter stage, and MongoDB Compass. $project Merge two collections into one using MongoDB We have different ways to combi...

MongoDB is very hungry for unstructured data and belongs in any database developer's toolset. Some aggregation processes are much slower than relational databases, even with existing indexes. This is the case when using joins between collec...

To perform aggregation operations with MongoDB, you need to have a good understanding of the aggregation pipeline stages. This tutorial will explore $sort the stages through an example to perform a MongoDB aggregation sort. MongoDB Aggregat...

Comparison operators are very useful when working with large data sets. They are helpful in gaining insights from the data. $nin This article explains how to use the ( ) comparison operator in MongoDB NOT IN . It also shows how to use $nin...

Duplicate a collection in the same database is an amazing task. It saves time and effort. This tutorial demonstrates how to replicate a collection in the same database using MongoDB mongodump , mongorestore , aggregate() and . forEach() Cop...

This article will tell you about all the fields in a database and how to check if they exist. In addition, you will learn how to check if an embedded field exists in a database. Fields in the database A field is a physical structure that ho...

In this MongoDB article, the problems with returning queries based on dates are pointed out. In addition, it explains in detail how to query using date ranges in MongoDB. Using date range queries in MongoDB This section will show you how to...

MongoDB Group by Multiple Fields is used to group values ​​by multiple fields using various methods. One of the most efficient ways to group various fields present in MongoDB documents is by using $group the operator, which helps in per...

When working in MongoDB, do you know the size of your database? Today, we will learn how to get the size of a database in MongoDB using show dbs the command and the method. db.stats() Get the size of the database in MongoDB We can show dbs;...

In this MongoDB article, you’ll get a walkthrough of Mongodump and Mongorestore , how to use them, and some simple examples of backing up and restoring your collections using both tools. mongodump Commands in MongoDB Mongodump is a tool t...

When using MongoDB , there are several ways to list the collections in the database. This article will discuss four different ways to get a list of collections in a MongoDB database. These methods are as follows: show collections List all c...