wpdb in wordpress code example

Example 1: wordpress wpdb

<?php
// 1st Method - Declaring $wpdb as global and using it to execute an SQL query statement that returns a PHP object
global $wpdb;
$results = $wpdb->get_results( "SELECT * FROM {$wpdb->prefix}options WHERE option_id = 1", OBJECT );

Example 2: wpdb wordpress

global $wpdb;