Bijay 
In this MongoDB tutorial, we are going to learn to “select the first element in an array in MongoDB” with a few examples. We will cover this by performing various operations with examples. The following list topics we are going to cover in this tutorial: How to select the first element in an array in MongoDB query … Read more >>
In this MongoDB tutorial, we will understand MongoDB nested query. We will cover this topic with different operations and examples. Additionally, we will also discuss the following list of topics: MongoDB nested query MongoDB provides a feature which is known as embedded or Nested document. The Embedded document or nested documents are those types of documents that … Read more >>
In this MongoDB tutorial, we will discuss MongoDB aggregate $count with a few examples. Here we will cover the below topics: MongoDB aggregate $count query In this topic, you will learn about MongoDB aggregate $count. It transfers a document to the next stage that contains a count of the number of documents input to the stage. … Read more >>
In this MongoDB tutorial, we are going to learn everything about MongoDB count with a few examples. We will cover this by performing various operations with examples. The following list topics we are going to cover in this tutorial: MongoDB count query In this topic, you will learn the MongoDB query. It is used to return … Read more >>
In this MongoDB tutorial, I will explain how I managed to resolve the error “Failed to set up listener: socketexception: address already in use MongoDB”. Socketexception: address already in use MongoDB When I run the command mongod in my terminal I get the following error message: From the error, It is clear that the address or … Read more >>
In this MongoDB tutorial, we will understand how to get collection size in MongoDB. Furthermore, We will cover the following list of topics: MongoDB get collection size MongoDB get collection size example MongoDB get size of a document from collection MongoDB get collection size in GB MongoDB get collection size in Ubuntu MongoDB get collection size using … Read more >>
In this PostgreSQL tutorial, we will learn about “Postgresql unique” and cover the following topics. Postgresql unique constraint In Postgresql, we want to ensure that values stored in a column or a group of columns are unique across the whole table such as email addresses or usernames. PostgreSQL provides us with the UNIQUE constraint that keeps … Read more >>
In this MongoDB tutorial, we will discuss the $in operator MongoDB. Additionally, we will also discuss the various examples where we will use the $in operator in MongoDB. $in MongoDB The $in operator in MongoDB is used to select the documents where the value of a field is equal to any value in the specified array. Syntax: … Read more >>
In this PostgreSQL tutorial, we will study the usage of the PostgreSQL subquery that will allow us to create queries within the query. And we are going to discuss the following list of topics. PostgreSQL subquery In PostgreSQL, A query is a question or a request for information expressed. A subquery is a query within … Read more >>
In this MongoDB tutorial, we will understand the Current date in MongoDB. We will cover this topic with different operations and examples. Furthermore, the following topics will cover: The current date in the MongoDB query In this topic, you will learn to create the current date field in MongoDB. The following two ways return date as a … Read more >>
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