JIYIK CN >

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...

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...

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...

ON DELETE CASCADE Before we start looking at different solutions for implementing in PostgreSQL , we will first understand ON DELETE CASCADE what is and what it does. Let's assume you have two tables, one of which inherits from a parent tab...

In our article, we mainly work on the PostgreSQL application called pgAdmin [app. number] , which can be downloaded from the PostgreSQL website. Therefore, we hope that you already have the application installed or another alternative where...

A VALUES in MySQL Auto_Increment is an auto-incrementing variable that helps provide a unique identification for a set of data in a table. It is most commonly used PRIMARY in a key to uniquely index a row. In MySQL, we can AUTO INCREMENT ap...