Is there any way to list all the database queries my WP install is making?

I found the answer in another forum:

1st Add define('SAVEQUERIES', true); to your wp-config.php

2nd, add this to your footer:

<?php if (current_user_can('administrator')){
    global $wpdb;
    echo "<pre>";
    print_r($wpdb->queries);
    echo "</pre>";
} ?>

I found another answer that doesn’t involve editing core files but I couldn’t get it to work properly:

Add this to the functions.php:

add_filter('posts_request','debug_post_request'); // debugging sql query of a post
function debug_post_request($sql_text) {
$GLOBALS['debugku'] = $sql_text; //intercept and store the sql
return $sql_text;
}

and add this to the footer:
<?php print_r($GLOBALS['debugku']); ?>