SELECT mainpage.page_title, revision.rev_timestamp

​

FROM page talkpage

​

INNER JOIN categorylinks ON talkpage.page_id = categorylinks.cl_from

INNER JOIN page mainpage ON mainpage.page_title = talkpage.page_title

INNER JOIN revision ON mainpage.page_id = revision.rev_page

​

WHERE categorylinks.cl_to = "All_Wikipedia_level-5_vital_articles"

AND mainpage.page_namespace = 0 AND talkpage.page_namespace = 1

AND revision.rev_parent_id = 0

ORDER BY revision.rev_timestamp DESC

LIMIT 50