Select database mysql. For example: mysql> SELECT 1 + 1; -> 2.

Select database mysql database_name est le nom de la base de données que tu veux utiliser. MySQL, as one of the most popular relational database management systems, uses the SELECT statement for querying data from the database. MySQL Show/List Databases When we work with the MySQL server, it is a common task to show or list the databases, displaying the table from a particular database, and information of user accounts and their privileges that reside on the server. MySQL, which was created by MySQL AB and later acquired by its current owner Oracle Corporation, was originally introduced in 1995. Jan 26, 2024 · Learn how to use the USE command to switch to a database and execute SQL queries in MySQL Shell. See syntax, examples, and errors for PHP, NodeJS, Java, and Python programs. To create We would like to show you a description here but the site won’t allow us. MySQL does not preselect a database for you. Just specify its name after any MySQL SQL MySQL SELECT MySQL WHERE MySQL AND, OR, NOT MySQL ORDER BY MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN and MAX MySQL COUNT, AVG, SUM MySQL LIKE MySQL Wildcards MySQL IN MySQL BETWEEN MySQL Aliases MySQL Joins MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL CROSS JOIN MySQL Self Join Mar 19, 2025 · Once you have connected to the open-source database management system, you need to select the database you want to work with in MariaDB. Summary: in this tutorial, you’ll learn how to use the MySQL SELECT statement without referencing any table. g. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. MySQL USE syntax. In a MySQL Database server, there may be multiple databases. Widely used in MySQL, SELECT is a fundamental command for querying databases. Example: Select/Switch Database. See Section 15. tables WHERE table_schema = 'library_db'; statement is crafted to fetch the names of tables stored in the library_db database. The database name, table name, and table fields’ names in MySQL are case-sensitive. Now the question is how to select the database in MySQL, From the mysql command line select database, and simply write the MySQL Use database command followed by your database name, like at the beginning of this mysql> USE menagerie Database changed. MySQL Command to Select a Database. MySQL addresses this problem through several statements that provide information about the databases and tables it supports. The SELECT statement allows you to select data from one or more tables. This is because there might be more than one database available with the MySQL Server. 有时，你可能忘记了你当前正在使用哪个数据库。别担心！MySQL有一个很方便的函数可以做到这一点： SELECT DATABASE(); 简介：在本教程中，您将学习如何mysql使用USE语句在程序和MySQL Workbench中选择数据库 。 Feb 20, 2023 · We are going to use a visual database design tool called MySQL Workbench. MySQL Show Databases. Sebuah database umumnya memiliki struktur penyusun. To select a database before you begin a MySQL session, use the following statement: USE database_name; Database changed Once you select a database, all the subsequent operations, such as creating tables, are performed on the selected database. From the list of databases, select the one you want to work with. This tutorial covers basic and advanced data retrieval, transaction management, and scripting with MySQL command line. Selecting a MySQL database using the mysql client tool. Jun 24, 2024 · The MySQL SELECT statement is essential for fetching data from tables. Learn how to use the USE statement or MySQL Workbench to select a database in MySQL. Databases store data for later retrieval. Every time we open a new session, we have to specify which database to use. The SELECT statement is used to select data from a database. user;. To write a SELECT statement in MySQL, you use this syntax: SELECT select_list FROM table_name; Code language: SQL (Structured Query Language) (sql) In this syntax: First, specify one or more columns from which you want to select mysql sql mysql select mysql where mysql and, or, not mysql order by mysql insert into mysql null values mysql update mysql delete mysql limit mysql min 和 max mysql count, avg, sum mysql like mysql 通配符 mysql in mysql between mysql 别名 mysql 联接 mysql inner join mysql left join mysql right join mysql cross join mysql 自联接 执行这个命令后，MySQL将切换到 my_bookstore 数据库，所有后续命令都将在这个上下文中执行。 示例 2：验证选择的数据库. The SELECT table_name FROM information_schema. Besides the SHOW DATABASES command, MySQL also provides another command called SHOW SCHEMAS , which is a synonym of the SHOW DATABASES command: SELECT can also be used to retrieve rows computed without reference to any table. Apr 21, 2013 · Anda boleh menginputnya satu per satu dengan perintah INSERT seperti yang telah kita pelajari pada Tutorial Cara Menambahkan data ke dalam Tabel dengan query INSERT. You have previously seen SHOW DATABASES , which lists the databases managed by the server. Feb 12, 2024 · In this basic query, we aim to retrieve a list of all tables within a specific MySQL database. It can be used anywhere a string constant would be expected. The command we use to select a database in MySQL is called the USE statement. Click on the "Schemas" button on the left-hand side of the screen. Enter the required details such as table name, column names, data types, and constraints. Apr 28, 2025 · Learn how to use the USE DATABASE and SELECT statements in SQL to select and query a database. user database. If you want to perform operations such as queries, you should select a database to be operated on first. Jul 7, 2024 · Selecting a database in MySQL is a simple but crucial step in managing your data. See examples, syntax, and alternative ways to specify the database name. This tutorial walks you through the process of selecting, viewing, and verifying a MySQL database on Linux via the command line in 3 steps. It is very simple to select a database from the mysql> prompt. Learn how to use the SQL USE statement to select a database in MySQL and perform operations on it. Feb 3, 2019 · database() is an information function provided by MySQL to return the name of the current database. Use the desc command to describe the table: desc mysql. . It's simple, straightforward, and incredibly powerful. You have two options for this: you can use the USE command in the MySQL command line or the mysql_select_db function in PHP. Open the MySQL Command Line with any user's credentials. Following query is used to select/switch the current database to testDB −. 在 mysql> 提示窗口中可以很简单的选择特定的数据库。你可以使用SQL命令来选择指定的数据库。 在线示例 MySQL SQL MySQL SELECT MySQL WHERE MySQL AND, OR, NOT MySQL ORDER BY MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN and MAX MySQL COUNT, AVG, SUM MySQL LIKE MySQL Wildcards MySQL IN MySQL BETWEEN MySQL Aliases MySQL Joins MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL CROSS JOIN MySQL Self Join Mysql requires you to select the particular database you are working on. The steps to selecting a database are as follows: Select a database in MySQL using the command line. Here is an example to select a database called TUTORIALS − [root@host]# mysql -u MySQL USE Statement - Learn how to use the MySQL USE statement to select a database for your queries effectively. The list of databases displayed by the statement may be different on your machine; SHOW DATABASES does not show databases that you have no privileges for if you do not have the SHOW DATABASES privilege. Selain itu saya juga menyediakan file text untuk diinput melalui query LOAD DATA INFILE, seperti pada Tutorial Menambahkan data dari File (LOAD DATA INFILE), file text tersebut dapat diambil dari link berikut: sample data tabel Learn MySQL Tutorial Reference Learn PHP Here, column1, column2, are the field names of the table you want to select data from. Suppose the database name schoolmanagementsystem, table name student, and table columns name are student_id, student_first_name, and student_last_name. For example: mysql> SELECT 1 + 1; -> 2. Here's how it looks: The output shows the 5 databases that include four system databases (information_schema, mysql, performance_schema, and sys) and a sample database classicmodels. Alternatively, you can select the database on the command line when you invoke mysql. When you log in to a MySQL database server using the mysql client tool without specifying a database name, MySQL server will set the current database to NULL. I presume it is a design decision they made: it avoids a lot of potential problems: e. MySQL 选择数据库. The MySQL SELECT Statement. 以下实例选取了数据库 RUNOOB: [root@host]# mysql -u root -p Enter password:***** mysql> use RUNOOB; Database changed mysql> Mar 20, 2022 · What is Select in MysQL? Select database(); basically displays the database which is currently in use. Learn how to select a MySQL database using the USE command from the Command Line tool and MySQL Workbench. Just specify its name after any Jun 21, 2024 · The relational databases, the ability to retrieve and manipulate data with precision is a cornerstone of effective database management. Jul 17, 2024 · SELECT QUERY is used to fetch the data from the MySQL database. Summary: in this tutorial, you will learn how to select a database in the mysql program and MySQL Workbench by using the USE statement. The data returned is stored in a result table, called the result-set. Understand its syntax and practical examples. Jul 8, 2024 · MySQL is a popular open-source relational database management system (RDBMS) that is uniquely used to construct expandable and high-productivity databases. Just specify its name after any Feb 12, 2020 · Select a MySQL Database # When you create a database, the new database is not selected for use. Home Whiteboard AI Assistant Online Compilers Jobs Tools Articles Corporate Training Practice MySQL SQL MySQL SELECT MySQL WHERE MySQL AND, OR, MySQL is a widely used relational database management system (RDBMS). Selecting MySQL Database from the Command Prompt. MySQL, a popular relational database management system, provides a powerful tool called the Nested SELECT statement that empowers developers to perform complex and Feb 19, 2024 · El comando SELECT DATABASE() se utiliza para seleccionar y mostrar el nombre de la base de datos MySQL actual. You can use the USE statement to select or switch databases. May 27, 2025 · つまり、MySQLサーバーがどのデータベースからデータを取得すべきか分からない状態です。解決方法方法1: USEコマンドを使用するデータベースを選択する USE database_name; ここで、database_nameは使用するデータベースの名前です。 May 4, 2023 · If you have connected to a MySQL database using the Command Line on Windows or Terminal on macOS/Linux and want to run queries against a particular schema/database, you can make use of the "USE" statement. May 29, 2017 · You can try this query. In MySQL for selecting a database, a USE statement is used. See examples of creating, selecting, and filtering a database in MySQL. MySQL Workbench enables us to create a database, create a table, insert data into the table, and run the SQL SELECT statement. It retrieves information and stores it in a result table, often referred to as a result set. 在你连接到 MySQL 数据库后，可能有多个可以操作的数据库，所以你需要选择你要操作的数据库。 从命令提示窗口中选择MySQL数据库. The way to select a database in MySQL is by using the USE command. Jan 25, 2024 · Introduction. Syntax: USE name; Parameters: name: It is used to specify the name of the database to be selected. Typically, you use a SELECT statement to select data from a table in the database: SELECT select_list FROM table_name; Code language: SQL (Structured Query Language) (sql) In MySQL, the SELECT statement doesn’t require the FROM clause. This chapter covered how to select a database and provided a full example of creating and using a database. Just specify its name after any Sep 9, 2024 · 最后，通过运行命令select database();来确认你已经成功选择了当前数据库。 请注意，你需要在登录到mysql服务器后才能执行这些操作。 2. MySQL is free and open-source. If the test database exists, try to access it: mysql> USE test Database changed Sep 18, 2024 · The system retrieves the information from the user column in the mysql. Learn how to use USE, -D, or \\u commands to switch to a specific database in MySQL command line interface (CLI). USE testDB; Output Database changed Once we finish switching to the database testDB we can perform operations such as creating a table, and inserting data in that table as shown below −. Follow the detailed steps with screenshots and examples for the command-line interface and the graphical interface. user Database Fields. Click on the "Create a new Table" button in the toolbar. Before expanding the search, list all available fields in the mysql. mysql> USE menagerie Database changed. Kemampuan mengambil data tertentu, fleksibilitas pemilihan kolom, serta praktik terbaik seperti penggunaan nama kolom yang lengkap, dapat meningkatkan efisiensi dan kualitas proyek serta memudahkan dokumentasi dan pemecahan masalah. it is entirely possible, for you to use the same table names across multiple databases e. So, to work with a particular database, we need to select it. Select database Step 4: Creating Table . a users table. Di dalam sebuah database , terdapat berbagai macam objek SQL, seperti views , dataset, tabel, procedure , dan lainnya. Select query can be used in scripting language like PHP, Ruby, or you can execute it via the command prompt. Just specify its name after any USE database_name; Décomposons cela : USE est le mot-clé qui indique à MySQL que tu veux sélectionner une base de données. Este tutorial tiene como objetivo proporcionar una comprensión exhaustiva del comando MySQL SELECT DATABASE, su uso, consejos y trucos, y formas de evitar errores comunes. There are multiple databases available in the MySQL server and workbench. Introduction to MySQL SELECT FROM statement. Now that you are connected to your MySQL server, everything is now set for selecting a database. Once a database is selected, you can perform various operations on it, such as creating tables and inserting data. Example. The purpose of MySQL Select is to return from the database tables, one or more rows that match a given criteria. 7. MySQL does not require a from clause, so a select is a complete query that returns one row -- the values calculated in the select. Uso del comando SELECT DATABASE; Sintaxis SELECT DATABASE W3Schools offers free online tutorials, references and exercises in all the major languages of the web. You can use the SQL command use to select a database. See examples, errors and tips for choosing the default database during login. Aug 30, 2023 · 現在選択しているデータベースを確認するには、select文でdatabase関数を使うと良いです。 testデータベースを選択した後に、下記のようにdatabase関数を使います。 select database(); そうすると、下記のように選択しているデータベースが表示されます。 Jun 5, 2024 · Step 2: Select The Database. Creating a database in MySQL client. To select a database as the default database, please use the USE statement as follow: Mar 17, 2025 · Related Posts. 15, “SHOW DATABASES Statement”. Your database needs to be created only once, but you must select it for use each time you begin a mysql session. N'oublie pas le point-virgule (;) à la fin - c'est comme le point à la fin d'une phrase dans MySQL ! Exemple 1 : Sélectionner une base de données W3Schools offers free online tutorials, references and exercises in all the major languages of the web. 我如何在mysql中切换到不同的数据库？ 要切换到不同的数据库，你可以按照以下步骤操作： 登录到mysql数据库服务器。 Selecting a database in MySQL is a simple but crucial step in managing your data. You can do this by issuing a USE statement as shown in the example. Salah satu perintah atau query yang cukup umum digunakan untuk mengambil data dari database dan tabel, adalah query SELECT. The SELECT statement is the backbone of data retrieval in any SQL-powered database system. In order to use the SQL SELECT statement in MySQL Workbench, we need to follow the following steps: Open the MySQL Workbench. You are permitted to specify DUAL as a dummy table name in situations where no tables are referenced: mysql> SELECT 1 + 1 FROM DUAL; -> 2 USE database_name; 参数说明： database_name 是你要选择的数据库的名称。 选择来数据库后，你的后续 SQL 查询和操作在指定的数据库 database_name 上执行。 实例. Add columns for a more detailed overview of MySQL users and their privileges. Nov 4, 2024 · Mempelajari pernyataan SELECT dalam MySQL penting untuk pengelolaan data yang baik dan aman. How to List mysql. qbhwqp qmef rjs ayd plzto grkve zadt twfqxzq kwtxap zedzjn