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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...

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 demonstrates connecting to a database, creating a new database, and creating a table in PostgreSQL. Available databases in PostgreSQL You can run the following command after opening the Postgres command line to view all availab...

There are two ways to access PostgreSQL objects and databases on your system. One is through an interface, such as a graphical interface like PGADMIN, and the other is the basic command line tool psql. Today, we will look at DROP DATABASE t...

This article shows various ways to connect to PostgreSQL using a password. It can be through the command line, pgpass a file, PGPASSWORD an environment variable or a connection string. Connecting to PostgreSQL with a password using the comm...

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...

NOT IN The inverts the result of NOT simply using IN the operator. NOT IN The right side of the operator must have a subquery in which multiple columns are returned to check whether the expression matches the data. NOT IN Tends to return tr...

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 ,...

MySQL PostgreSQL is an object-relational database system, which means it can support more complex data types than its competitors . Today we will learn how to use SELECT the operator to join the columns of a table. Using operators to || joi...