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This article explains the operators in MongoDB. What is the purpose of $push and $addToSet operators. Furthermore, the difference between these two operators is given in the code snippet. This article discusses the following topics. Operato...

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...

In this article, we will learn about schema and database and the basic difference between them. schema and database are two of the most important terms in Database Management Systems (DBMS). Every organization, school, college and other ins...

Today's topic is about duplicating rows in MySQL database. We will learn how to copy a row and paste it into the same table with auto increment ID and custom ID. We will also see how to copy multiple fields from multiple rows of one table a...

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, we aim to explore how to display foreign keys for tables and columns in MySQL. The type of key that references a primary key, also known as the primary key of another table, is called a foreign key. Understanding the forei...

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...

This tutorial will explain how to use the statement in MySQL database UPDATE JOIN . We generally use joins to iterate over the rows in a particular table which may or may not have similar rows in other tables. We can UPDATE use JOIN the cla...

In this tutorial, we will learn how to join three tables in MySQL. Businesses and organizations may have to visualize three tables simultaneously based on certain matching columns common to all three tables. This operation is allowed in MyS...

Have you ever wondered how to include multiple joins in one query in MySQL? You have come to the right place. Remember that joins allow us to access information from other tables. This information is included separately to avoid redundancy....

DATETIME and TIMESTAMP are two different data types that can be used to store values ​​that must contain both a date and a time portion. In this article, we will understand how it is stored in the database and the memory required for ea...

This article describes how to rename a column and change its type in PostgreSQL using only a single query. Renaming and changing column types in MySQL In MySQL , if you want to change the column type and rename it, you can use a simple stat...