SQL help please.

<?php
$sql = "SELECT * FROM table_name WHERE field='something'";
/* Above is a very common sql query used in verified that username is equal to the username in the database. */

$sql = "INSERT INTO table_name (name) VALUES('name')";
/* Above is a insert data into a database query */

$sql = "UPDATE table_name SET name='somethingelse'";
/* Above is a update value in database query */

$sql = "DELETE FROM table_name WHERE name='something'";
/* Above is a delete all the values where name is equal to something */

Following all these are
mysql_query($sql);
// That command processes the sql query
?>

<?php

$sql = "CREATE TABLE example(
id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), name VARCHAR(30), age INT)";
/* Above creates a table with AUTO INCREMENT (Or addes one everytime you add result) for field id. aswell as creates field name, and age. */

?>

<?php
mysql_query('CREATE DATABASE databasename');
?>