SELECT a.*
FROM commenttoarticle a
JOIN commenttoarticle b
ON b.CommentToArticlePID = a.idCommentToArticle
ORDER
BY a.idCommentToArticle DESC
LIMIT 3
SELECT a.*
FROM commenttoarticle a
JOIN commenttoarticle b
ON b.CommentToArticlePID = a.idCommentToArticle
ORDER
BY a.idCommentToArticle DESC
LIMIT 3