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This article will cover the various ways to add to an array in MongoDB. Adding to an array in MongoDB Use the $push operator to add values ​​to an array The $push operator is one of the various array update operators provided by MongoDB...

This article discusses operators in MongoDB, aggregation operators, and different ways to calculate the total number of records. Operations in MongoDB CRUD operations are a user interface concept that allows users to browse, search, and cha...

With the help of this article, you will learn how to use $set the operator to partially update objects in MongoDB so that the new object overlaps/merges with the existing object. The $set operator replaces the value of a field with a given...

This article will discuss how the $ne operator works in MongoDB. In addition, we will list its differences from the $not operator. $ne operator in MongoDB $ne is an operator in MongoDB that stands for not equal to. This will compare the val...

Remote connectivity is required when we work in a distributed environment. This tutorial is a step-by-step guide on how to connect to a remote MySQL database using the command line. Connect to a remote MySQL database using the command line...

As a database administrator, there are certain situations and circumstances where you have to search the entire database for the occurrence of a pattern or a string. For example, how many employees use Gmail accounts in your office, or you...

Creating a copy of an existing database is known as the MySQL Clone method. Cloning involves creating a copy of the table structure, constraints, functions, procedures, triggers, and all functionality associated with the table in one go. Th...

Sometimes, you have to select first N rows of MySQL database according to your project requirements. n The value of varies according to the requirement; it can be TOP 1 row or TOP 30 rows. We will learn how to select top N rows using the cl...

In this tutorial, our goal is to explore the concept of multiple primary keys for a table in MySQL. Many times, businesses and organizations have to assign certain columns as primary keys. This primary key has multiple uses and reasons to b...

In this tutorial, we will explain how to use the VALUES function in MySQL ROW_NUMBER() . This is a sorting method that assigns consecutive numbers within a partition starting from 1. It is important to note that no two rows within a partiti...

In this tutorial, we aim to explore how to use IF ELSE the statement in MySQL. One of the key roles of a data analyst is to gather insights from the data and produce meaningful results. It can be done with the help of several data filtering...

This article discusses how to use PostgreSQL replace() functions to replace strings. Use the PostgreSQL replace() function to replace strings PostgreSQL replace() functions have the following arguments, which are all text types: replace (st...

This article will demonstrate how we can declare and assign values ​​to variables in PostgreSQL. In PostgreSQL, DECLARE variables are declared using Often you will need variables in your PL/SQL scripts. In DECLARE the section called , y...

This article shows how to use the statement in PostgreSQL CASE . CASE How to use the statement in PostgreSQL case Statements are similar to those in general-purpose programming languages if-else . But in SQL, if you want to write IF-ELSE ,...

In this article, we will learn how to terminate a PostgreSQL session. Any open connections are run by background processes or tasks, PSQL which may no longer exist despite exiting the user interface or command line tool. Use ps -ef or grep...