As we know, MongoDB documents have the ability to possess arrays as field values, these arrays may enclose multiple elements. The $size operator can clubbed with other MongoDB methods like find(), findOne(), etc to filter documents based on the number…
You must have seen that in all our articles we have mentioned the date of publishing the article right after the title. Let’s say you are also developing an application and using MongoDB as the database for your app. Now…
MongoDB lets us create multiple users. A user can create multiple databases. A database can have multiple collections. A collection can have multiple documents. We already know how to get documents from a collection in Mongo Shell. It can be…
We all have heard how to do pretty print in MongoDB. It is used to format the query results with a proper indentation and log more readable output. We usually do it in Mongo Shell using the pretty() function. Even…
Suppose you have a collection of students containing lots of documents having indexes like Name, Age, Class, etc. One of the indexes or attributes in the documents is Optional Subject. For context, an optional subject is a subject people choose…
Many developers use MongoDB to store data when working with Node.js since NoSQL is considered best for it. But what if someone wants to work with SQL databases? The traditional option is to go with MySQL database, but it lacks…
MongoDB is used to store huge amounts of records in the form of documents having different fields. Now suppose, a school using MongoDB for storing its student record has a collection of students, this collection contains hundreds of documents of…
Databases have changed the way individuals and corporations handle and manage large amounts of data. It has enabled app developers, software engineers, data scientists and others to make life simpler than ever before. MongoDB, DynamoDB, PostgreSQL, MySQL, Cassandra, Redis, Aerospike,…
MongoDB is one of the most famous NoSQL databases among developers for storing huge amounts of data in the form of documents. We can easily do CRUD (Create, Read, Update, Delete) operations using different methods in a MongoDB database. In…
In Solidity, we generally use assert() and require() to write code with conditioning to make sure that the smart contract behaves as expected. Both can be used for checking conditions during transactions but have a huge difference which we often…