The CREATE TABLE statement is used to create a table, while creating a table we can define several constraints such as primary key, unique key,auto_increment, etc. We must add the CREATE TABLE statement to the mysqli_query() function to execute the command. 

Ex (Create Table):

Syntax

create table users(
  id INT AUTO_INCREMENT,
  name VARCHAR(20) NOT NULL,  
  salary INT NOT NULL,
  primary key (id)
)

MySQLi Table Detail

The data type specifies what type of data the column can hold. For a complete reference of all the available data types, go to our Data Types reference.

After the data type, you can specify other optional attributes for each column:

• NOT NULL - Each row must contain a value for that column, null values are not allowed
• DEFAULT Value - Set a default value that is added when no other value is passed
• UNSIGNED - Used for number types, limits the stored data to positive numbers and zero
• AUTO_INCREMENT - MySQLi automatically increases the value of the field by 1 each time a new record is added
• PRIMARY KEY - Used to uniquely identify the rows in a table. The column with the PRIMARY KEY setting is often an ID number and is often used with AUTO_INCREMENT

<?php
	$db=mysqli_connect("localhost","root","","users") or die(mysqli_error());
	// Create table
	
	$sql="CREATE TABLE users(
		id INT AUTO_INCREMENT,
		name VARCHAR(20) NOT NULL,  
		salary INT NOT NULL,
		primary key (id)
	)";
	if (mysqli_query($db,$sql)){
		echo "Table user created successfully";
	}else{
		echo  "Error creating database: " .mysqli_error($db);
    }
?>

Output:

Table users created successfully