Oh, that would have to be done via the Data Explorer Plugin.
This might get you there (replace my username with your own).
SELECT u.username, t.id, t.posts_count, p.post_number FROM topics AS t
LEFT JOIN posts AS p ON t.id = p.topic_id AND t.posts_count = p.post_number
LEFT JOIN users AS u ON p.user_id = u.id
WHERE u.username = 'cpradio'
It is grabbing the posts that have a post_number the same value as the posts_count for the topic (thus the last post), and then checking that the username on that post is ‘cpradio’
last-reply.dcquery.json (363 Bytes)