What does the CREATE TABLE statement do? code example

Example 1: how to create table in sql

//to create a table
CREATE TABLE students
( student_id number(4) primary key,
  last_name varchar2(30) NOT NULL,
  course_id number(4) NULL );

//to insert value
INSERT INTO students VALUES (200, 'Jones', 101);
INSERT INTO students VALUES (201, 'Smith', 101);
INSERT INTO students VALUE (202, 'Lee' , 102);

Example 2: how to create table in sql

# Creates a Simple User table
# Uses an auto-incrementing primary key as userId 

CREATE TABLE user (
    userId INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(100),
    password VARCHAR(100) 
) ENGINE=InnoDB;