In this MongoDB Operators tutorial, we will be learning different types of operators provided by MongoDB. Basically, we’ve all sorts of operators available in MongoDB as we have in other programming languages. You will be easily able to relate to these operators and understand them quickly. Before jumping on to the type of operators, let’s quickly revise what operators are. In simple terms, operators are special symbols that tell the compiler or interpreter to carry out specific mathematical or logical manipulations. Different Types of MongoDB Operators There are various types of operator ..read more

MongoDB Projection helps to return the specific fields from the query (or you can say from the MongoDB collection).  By default, when we query any collection in MongoDB, it returns all fields in matching documents.  Now, at times, we may not want all the records from the collection but a few of them in the result set. So, in that case, we use MongoDB projection (using projection document) to limit the amount/fields of data. In previous tutorial articles, you had already seen that how we query collection documents. We use MongoDB find command to query and fetch certain records from th ..read more

Indexes are important aspects while reading or fetching the documents. If we do not have indexes set up, we must scan every document of the collection to find and fetch the document that matches the query statement. Doing full scan degrades the performance of the application and is very inefficient considering when we are dealing with large volume of data and processing it. But the good news is that MongoDB provides a very easy and efficient way to implement indexes. If an appropriate index exists for a query, MongoDB can use the index to limit the number of documents it must inspect and hence ..read more

In this article, we will learn about MongoDB Find command. This command is used to query the documents available in the collection. This is similar to the ‘select’ statement in the relational databases. As in SQL, we can use various options with ‘select’ statement to retrieve the data, here in MongoDB also, Find command provides various option/properties to fetch the required data. You can read RDBMS vs MongoDB to understand better. MongoDB Find Command I will explain a few options provided by Find method with the examples and code in this article. We will learn other options in the subsequent ..read more

In this chapter, we will talk about MongoDB delete documents – how to delete documents in the collection. There are many ways in MongoDB from which we can delete documents in the collection: collection.remove() collection.deleteOne() – New in version 3.2. collection.deleteMany() – New in version 3.2. collection.findOneAndDelete() Let’s read about them in brief. MongoDB Delete Documents There are many methods to delete documents in MongoDB as mentioned above. Let’s go through these methods to understand it better. db.collection.remove() This method deletes a single document or all documents ..read more

In this chapter, we will talk about MongoDB update documents – how to update documents in the collection. There are many ways from which we can update documents in the collection: collection.updateOne() collection.updateMany() collection.update() collection.findOneAndUpdate() collection.replaceOne() collection.findOneAndReplace() collection.findAndModify() collection.save() Let’s read about them in brief. MongoDB Update Documents There are many update methods to update documents in MongoDB as mentioned above. Let’s go through these methods to understand it better. 1) collection.updateOne() T ..read more

In this chapter, we will learn about MongoDB insert documents – how to insert documents in the collections. There are following ways from which we can insert documents in the collections: insert () Method insertOne() Method insertMany () Method Let’s see these methods in brief. MongoDB Insert Documents insert () Method – Inserting the documents In MongoDB, the db.collection.insert() method is used to add or insert new documents into a collection in your database. Syntax: db.COLLECTION_NAME.insert(document)   Let’s take an example to demonstrate how to insert a document ..read more

In the previous articles, you have learned what is MongoDB and what are advantages of MongoDB over SQL. In this article, we will learn about downloading and installing MongoDB on Windows & MAC and other operating systems. This will be a very small article since setting up MongoDB is a very simple task. Just follow the below sections. Downloading MongoDB On Windows & MAC MongoDB is an open source software. The very first step is to download MongoDB. Check and download the latest and stable version available. You can download the MongoDB version which your system supports, from the offic ..read more

In this article, we will read about MongoDB vs RDBMS – What’s The Difference? In the previous articles, you have read that MongoDB is a NoSQL database. Generally, SQL databases are mainly used for accessing relational databases. RDBMS was always the first choice for all type of applications. But soon the scalability became the major issue as data started growing exponentially. To avoid that, NoSQL was brought in the market. MongoDB is such an approach to utilize the NoSQL database efficiently. The major difference between MongoDB and RDBMS(SQL Databases) is the way they handle data. In RDBMS ..read more

In the previous article, you have read about what is MongoDB and what is a document-oriented database and NoSQL database. In this article, you will learn about some key features of MongoDB. There are many awesome features that have made MongoDB so popular. Basically, MongoDB was introduced to overcome relational databases approach and limitations of other NoSQL solutions. And, MongoDB has brought in some more, very important and useful features. Top 10 Key Features Of MongoDB There are many key features of MongoDB that make it a preferred database when approaching modern web application d ..read more