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 done by using find(), findOne(), like method. However, as a beginner, we don’t usually log […]
List All Users, Collections, and Databases in the Mongo Shell Read More »
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 we have a dedicated article on it: Pretty Print in MongoDB, where we have shown
How to Unpretty Print in MongoDB – A Detailed Guide Read More »
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 beyond the regular curriculum subjects. So you want to filter students having Computer Science, Physical,
MongoDB $in Operator: A Detailed Guide Read More »
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 many things and advanced operations. Here comes PostgreSQL. PostgreSQL is one of the popular MySQL
Setup PostgreSQL with Node.js: A Step-by-Step Guide Read More »
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 students with different fields like Name, Class, Age, etc. Now for the vaccination school wants
$gte and $lte Operators in MongoDB: Ultimate Guide Read More »
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, Firebase Realtime and others are well-known databases. We can divide these databases into two categories:
MongoDB vs DynamoDB: Choosing the Right Database for Your Project Read More »
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 this article, we will particularly focus on print document values in the Mongo shell, i.e.,
Print Document Values in the Mongo Shell Read More »
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 ignore. Using assert() where you actually have to use require() and using require() where it
Assert vs Require in Solidity: Which One to Use When Read More »
Solidity is an object-oriented high-level programming language that is personalized exclusively for building smart contracts. It draws inspiration from other programming languages like JavaScript, Python, and C++, making it easy to learn. We can easily send Ethereum to a message sender using Solidity programming language just by writing a few lines of code. Sending Ethereum
How to Send Ethereum to Message Sender in Solidity? Read More »
Mongoose is an ODM (Object Document Mapper) that allows users to conveniently create and manage data in MongoDB. While it is possible to manage data, define schemas, etc. using MongoDB APIs, it is quite difficult to do so. Hence, Mongoose has made lives easier. When using Mongoose sometimes errors can occur and we don’t know
How to Check if Mongoose is Installed in Node.js? Read More »