How to use sql to create a new table in mysql database

To create a new table in MySQL, you need to follow the following steps: connect to the database; write the CREATE TABLE statement, specify the table name, column name, data type, and set constraints and default values; execute the CREATE TABLE statement; Use SHOW TABLES to verify that the new table has been created.

How to use SQL to create a new table in MySQL database

Creating a new table in MySQL database is very simple, Just use the following steps:

1. Connect to the database

First, connect to your MySQL database using the following command:

<code>mysql -u <用户名> -p</code>

Where:

• <Username> is your MySQL username
• -p means you need to enter the password

2. Write a CREATE TABLE statement

Next, write a CREATE TABLE statement to create a new table. The basic syntax of this statement is:

<code>CREATE TABLE <表名> (
    <列名> <数据类型> [NOT NULL] [DEFAULT <默认值>]
);</code>

where:

• <Table name> is the name of the new table you want to create
• <Column Name> is the name of the column you want to create
• <Data Type> is the name you want to use for the column Data type (for example, INT, VARCHAR, DATE, etc.)
• NOT NULL Constraint means that the column cannot contain NULL values ​​
• DEFAULT <Default value> Set to use a value other than NULL when inserting the column

3. Execute the CREATE TABLE statement

After writing the CREATE TABLE statement, use the following Command to execute it:

<code>CREATE TABLE <表名> (
    <列名> <数据类型> [NOT NULL] [DEFAULT <默认值>]
);</code>

For example, to create a table named customers with three columns: id (primary key), name (name) and email (email address), you can use the following statement:

<code>CREATE TABLE customers (
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(255) NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL
);</code>

4. Verify the new table

Execute CREATE After the TABLE statement, you can verify that the new table was created using the following command:

<code>SHOW TABLES;</code>

You should see the newly created table name listed in the results.

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