USE arwiki_p; #set the language/project database

​

SELECT a.article_course_id, a.article_user_id, a.article_page_title, SUM(CAST(r.rev_len as signed) - CAST(COALESCE(p.rev_len,0) as signed)) AS bytes_added, COUNT(r.rev_id) AS edit_count

    FROM ep_articles a

        JOIN revision r

        ON r.rev_page = a.article_page_id

        LEFT OUTER JOIN revision p

        ON p.rev_id = r.rev_parent_id

WHERE article_course_id IN (63)

GROUP BY article_page_title

ORDER BY bytes_added DESC;

​

SELECT c.course_id,c.course_start,c.course_end,u.user_id,u.user_name,a.article_page_title

    FROM ep_courses c

        LEFT JOIN user u

            ON u.user_id = if(instr(c.course_students,concat(":",u.user_id,";"))>0,u.user_id,c.course_students)

            AND u.user_id > 1000 #to weed out the registration numbers

        LEFT JOIN ep_articles a

            ON a.article_user_id = u.user_id

            AND a.article_course_id IN (63)

WHERE c.course_id IN (63)

GROUP BY article_page_title

ORDER BY course_id, article_page_title;