Solution :
<?php
$current_user = wp_get_current_user();
$sqry = “SELECT *
FROM WP_mr_rating_item_entry_value
WHERE rating_item_entry_id IN (SELECT rating_item_entry_id
FROM WP_mr_rating_item_entry
WHERE post_id = $post->ID
AND username ='”.$current_user->user_login.”‘)
ORDER BY rating_item_id asc”;
?>