mysql how to build a database

MySQL is a popular relational database management system that is used for backend data storage in many applications and websites. In this article, we will learn how to set up a database in MySQL.

MySQL server must be installed and running on your computer, and to create a database on the server, you can use a MySQL command-line client program or a GUI tool like phpMyAdmin.

Either way, you will need to provide login information to the server, such as a username and password, in order to gain access to the server. Next, we will introduce step by step how to use the MySQL command line client to create a database.

Step 1: Open the command line client

Open your terminal or command line window and type the following command:

mysql -u 用户名 -p

The "username" here is your database login username. After pressing enter, you will be asked to enter your password. After entering, press the Enter key.

In this example, we use the username "root" and password "123456" to connect to the MySQL database:

mysql -u root -p

Step 2: Create the database

Successfully log in to MySQL After that, you can start creating the database. In MySQL, you can run SQL commands to create a database. Type the following command:

CREATE DATABASE 数据库名;

The "database name" here is the name you want to name the database. Note that in SQL commands, statements must end with a semicolon.

Here is an example, we create a database named "mydatabase":

CREATE DATABASE mydatabase;

If the command is executed successfully, you will see a message saying "Query OK, 1 row affected" .

Step 3: Select the database

Now, you have created a database, but you need to tell MySQL the database the user will use. Use the following command:

USE 数据库名;

In this example, we will select the database named "mydatabase":

USE mydatabase;

If the command is executed successfully, you will see a message saying "Database changed ".

Step 4: Create the table

Once you have selected the database you want to use, you need to create the table. Tables are where data is placed. Here is the basic syntax for creating a table:

CREATE TABLE 表格名 (
   列1 数据类型,
   列2 数据类型,
   .....
   列N 数据类型
);

In the above syntax, column and data type are the names and types of columns you want to create in the table. Here is a sample table:

CREATE TABLE customers (
   id INT,
   name VARCHAR(255),
   address VARCHAR(255),
   city VARCHAR(255)
);

In this example, we have created a table called "customers" with columns for a number, a name, an address, and a city.

If the command executes successfully, you will see a message saying "Query OK, 0 rows affected".

Now that you have successfully created a database and a table, you can start inserting data into the table and perform other operations.

Summary

Setting up a database in MySQL is an important task that will enable you to store and manage data. Databases can be created through the MySQL command line client or other MySQL GUI tools. When using the command line client, you provide login information to the server and use SQL statements to create databases and tables. Once created, you can insert data into the table and perform other operations.

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