Show WordPress database queries at the footer only to the admin if WP_DEBUG is enabled

show-wordpress-db-queries.php

<?php
/**
 * db QUERIES
 * Prerequisite: define('SAVEQUERIES', true)
 */
function nano_enqueue_db_queries() {
	global $wpdb;
	echo '<h2>Database Last Query</h2>';
		echo $wpdb->last_query;
	echo '<hr>';
	echo '<h2>Database Queries</h2>';
		var_dump( $wpdb->queries );
}
if ( WP_DEBUG && current_user_can( 'administrator' ) )
	add_action( 'wp_footer', 'nano_enqueue_db_queries' );