SELECT CONCAT('[[Special:Diff/', r.rev_id, ']]') AS diff,

       DATE_FORMAT(r.rev_timestamp, '%Y-%m-%d %H:%i:%s') AS date,

       CONCAT('[[', CASE page_namespace

                      WHEN -2 THEN 'Media:'               WHEN -1 THEN 'Special:'

                      WHEN 0 THEN ''                      WHEN 1 THEN 'Talk:'

                      WHEN 2 THEN 'User:'                 WHEN 3 THEN 'User talk:'

                      WHEN 4 THEN 'Wikipedia:'            WHEN 5 THEN 'Wikipedia talk:'

                      WHEN 6 THEN ':File:'                WHEN 7 THEN 'File talk:'

                      WHEN 8 THEN 'MediaWiki:'            WHEN 9 THEN 'MediaWiki talk:'

                      WHEN 10 THEN 'Template:'            WHEN 11 THEN 'Template talk:'

                      WHEN 12 THEN 'Help:'                WHEN 13 THEN 'Help talk:'

                      WHEN 14 THEN ':Category:'           WHEN 15 THEN 'Category talk:'

                      WHEN 100 THEN 'Portal:'             WHEN 101 THEN 'Portal talk:'

                      WHEN 108 THEN 'Book:'               WHEN 109 THEN 'Book talk:'

                      WHEN 118 THEN 'Draft:'              WHEN 119 THEN 'Draft talk:'

                      WHEN 446 THEN 'Education Program:'  WHEN 447 THEN 'Education Program talk:'

                      WHEN 710 THEN 'TimedText:'          WHEN 711 THEN 'TimedText talk:'

                      WHEN 828 THEN 'Module:'             WHEN 829 THEN 'Module talk:'

                      WHEN 2300 THEN 'Gadget:'            WHEN 2301 THEN 'Gadget talk:'

                      WHEN 2302 THEN 'Gadget definition:' WHEN 2303 THEN 'Gadget definition talk:'

                      ELSE CONCAT('{{ns:', page_namespace, '}}:')

                    END, page_title,']]') AS title,

       (r.rev_len - COALESCE(prev.rev_len, 0)) AS delta,

       comment_text

FROM revision_userindex AS r

JOIN actor_revision ON actor_id = r.rev_actor

LEFT JOIN page ON page_id = r.rev_page

LEFT JOIN comment_revision ON comment_id = r.rev_comment_id

LEFT JOIN revision AS prev ON prev.rev_id = r.rev_parent_id

WHERE actor_name = 'Ahecht'

  AND (r.rev_len - COALESCE(prev.rev_len, 0)) >= 5000

ORDER BY delta DESC;

​