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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...

The PostgreSQL official documentation states, ``LATERAL 关键字可以位于子 SELECT FROM 项之前。这允许子 SELECT 引用出现在 FROM 中的 FROM 项的列（如果没有 LATERAL ，每个子 SELECT 都是独立评估的，因此不...

USERNAME Many PostgreSQL users may be asked for their database settings for the first time when logging in PASSWORD . However, just learning these settings is not all you need to know. What is the server in Rails 4? The server in Rails 4 us...

PSQL is a terminal-based front-end for the PostgreSQL database server. It uses either command-line arguments from an input file or from the command line, and is portable and easy to use. It also helps in writing scripts and letting other ta...

Before we start looking at different solutions to this problem, let's understand what a CSV file is and how output works in PL/pgSQL. PL/pgSQL output is the data displayed after running certain types of queries in PostgreSQL. Sometimes, as...

Let's start with a simple question. INFORMATION_SCHEMA What exactly is it? INFORMATION_SCHEMA Provides us with information about the objects defined in our database. It contains a set VIEWS of objects that store QUERY the database objects....

This article will use the PostgreSQL database to show the different commands we can use to return a collection of database tables. MySQL A common command you will encounter in databases is , SHOW TABLES but in PostgreSQL, the database manag...

When we develop applications, we end up hosting them with the desired cloud providers under specific monthly or annual subscriptions. Depending on your plan, these subscriptions provide us with different services like data stored in databas...

Unlike SQL Server, PostgreSQL does not have a built-in DATEDIFF function to calculate the difference between dates. However, you can use expressions that include other functions provided by PostgreSQL to obtain the difference between dates....

In this tutorial, we will learn how to insert data from a database hosted on a remote server into a database in our local computer. We will use the remote service provider Heroku PostgreSQL, which offers a free plan for testing purposes. In...

PostgreSQL provides many functions and operators for built-in data types. This tutorial will give an example of extracting the date from a timestamp in PostgreSQL or Postgres. CAST Extracting the date from a timestamp using the operator in...

In this article, we will learn how DATEFIELD to find the day of the week from a given in the table in PostgreSQL. We will also learn about different operations that you can use to manipulate and work with DATEFIELD the data in . We use EXTR...

Before we begin, let's define what a timestamp is in SQL. From the PostgreSQL documentation under the DATE/TIME heading, a timestamp is a data type that stores a date and time in the following format. YYYY-MM-DD hh:mm:ss (DATE | TIME) The s...

with Statements are used to create temporary tables, which means that these tables are not persisted in the database and exist only in memory until the query is completed. The statement was introduced with to break down complex queries into...

The remote host uses the Linux system. The first step is definitely to establish a code synchronization mechanism on the local and remote hosts - sftp is the first choice. The second step is to write the CMakeLists.txt file of redis4. There...