What is the syntax for creating tables in mysql database

Use CREATE TABLE syntax to create a MySQL table. You need to specify the table name, column name, data type, whether to allow null values ​​and default values. Among them, the table name and column name are case-sensitive, the primary key column must be non-null, and the default value should comply with the data type constraints.

MySQL table creation syntax

The syntax for creating a table in MySQL is as follows:

<code>CREATE TABLE table_name (
  column_name1 data_type1 [NOT NULL] [DEFAULT default_value1],
  column_name2 data_type2 [NOT NULL] [DEFAULT default_value2],
  ...
) [table_options];</code>

Detailed explanation of syntax:

• CREATE TABLE: Specify the command to create a table.
• table_name: The name of the table to be created.
• column_nameX: The name of each column to be created.
• data_typeX: The data type of each column.
• NOT NULL: The specified column cannot have a NULL value.
• DEFAULT default_valueX: Specifies the default value of the column. If no value is explicitly specified, this default value is used.
• table_options: Can be used to specify table-level options, such as storage engine, character set, etc.

Example:

Create a table named "employees", which contains three columns: "id" (primary key), "name" ( String) and "salary" (number):

<code class="mysql">CREATE TABLE employees (
  id INT NOT NULL AUTO_INCREMENT,
  name VARCHAR(255) NOT NULL,
  salary DECIMAL(10, 2) NOT NULL
);</code>

Note:

• Table names and column names are case-sensitive.
• The primary key column must be specified as "NOT NULL".
• The default value can only be a valid value of the column data type.
• The "table_options" section can be added or omitted as needed.

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